The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A078591

(Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A078591

Number of nonisomorphic ways a loop can cross a road (running East-West) 2n times.
(history; published version)

#19 by Michael De Vlieger at Wed Aug 10 10:07:18 EDT 2022

STATUS

reviewed

approved

#18 by Michel Marcus at Wed Aug 10 09:14:35 EDT 2022

STATUS

proposed

reviewed

#17 by Jean-François Alcover at Wed Aug 10 08:05:22 EDT 2022

STATUS

editing

proposed

Discussion

Wed Aug 10

09:14

Michel Marcus: merki !!

#16 by Jean-François Alcover at Wed Aug 10 08:02:42 EDT 2022

DATA

1, 1, 1, 4, 21, 131, 914, 6910, 55477, 466729, 4076430, 36712325, 339195058, 3202515525, 30803440806, 301094270964, 2984903334517, 29961600364523, 304094354787062, 3117138919265903, 32238856059792302, 336132907436386486, 3530470987229030696, 37330864330583904876, 397168915877285183906, 4249533314257706614641, 45706449449414088413122, 493987955498019277994743, 5363004181680921367192822

LINKS

Jean-François Alcover, <a href="/A078591/b078591.txt">Table of n, a(n) for n = 0..28</a>

STATUS

proposed

editing

Discussion

Wed Aug 10

08:02

Jean-François Alcover: Done

#15 by Jean-François Alcover at Wed Aug 10 04:00:19 EDT 2022

STATUS

editing

proposed

Discussion

Wed Aug 10

04:03

Michel Marcus: I think you should create a b-file and cut data after 397168915877285183906

#14 by Jean-François Alcover at Wed Aug 10 03:57:56 EDT 2022

DATA

MATHEMATICA

A005315 = Cases[Import["https://oeis.org/A005315/b005315.txt", "Table"], {_, _}][[All, 2]];

a[n_] := If[n < 3, 1, A005315[[n+1]]/2];

Table[a[n], {n, 0, 28}] (* Jean-François Alcover, Aug 10 2022, after Andrew Howroyd *)

EXTENSIONS

a(21)-a(28) computed from A005315 added by Jean-François Alcover, Aug 10 2022

STATUS

approved

editing

#13 by Bruno Berselli at Tue Nov 24 04:38:53 EST 2015

STATUS

reviewed

approved

#12 by Michel Marcus at Mon Nov 23 16:39:44 EST 2015

STATUS

proposed

reviewed

#11 by Andrew Howroyd at Mon Nov 23 15:13:33 EST 2015

STATUS

editing

proposed

Discussion

Mon Nov 23

16:39

Michel Marcus: Thanks.

#10 by Andrew Howroyd at Mon Nov 23 15:12:39 EST 2015

EXTENSIONS

a(10)-a(20) added by Andrew Howroyd, Nov 23 2015

STATUS

proposed

editing