The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A085223

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

A085223

Row 1 of A085201.
(history; published version)

#6 by N. J. A. Sloane at Sat May 18 14:46:39 EDT 2024

STATUS

proposed

approved

#5 by Michel Marcus at Sat May 18 13:50:48 EDT 2024

STATUS

editing

proposed

#4 by Michel Marcus at Sat May 18 13:50:44 EDT 2024

AUTHOR

Antti Karttunen , Jun 23 2003

STATUS

approved

editing

#3 by Russ Cox at Sat Mar 31 14:02:29 EDT 2012

AUTHOR

_Antti Karttunen (HisFirstname.HisSurname(AT)iki.fi) _ Jun 23 2003

Discussion

Sat Mar 31

14:02

OEIS Server: https://oeis.org/edit/global/917

#2 by N. J. A. Sloane at Fri Feb 24 03:00:00 EST 2006

FORMULA

a(n) = A085201bi(n, 1) = A057164(A072795(A057164(n))) = A057508(A072795(A057508(n))) = A080300(A085224(n))

KEYWORD

nonn,new

nonn

#1 by N. J. A. Sloane at Sat Sep 13 03:00:00 EDT 2003

NAME

Row 1 of A085201.

DATA

1, 2, 4, 6, 9, 11, 14, 16, 19, 23, 25, 28, 30, 33, 37, 39, 42, 44, 47, 51, 53, 56, 60, 65, 67, 70, 72, 75, 79, 81, 84, 86, 89, 93, 95, 98, 102, 107, 109, 112, 114, 117, 121, 123, 126, 128, 131, 135, 137, 140, 144, 149, 151, 154, 156, 159, 163, 165, 168, 172, 177, 179

OFFSET

0,2

COMMENTS

Gives in A014486 the positions of the plane general trees whose rightmost subtree (branching from the root) is just a stick: "/", thus corresponding to the parenthesizations whose last element (of the top-level list) is an empty parenthesization: (), i.e. in A063171 positions of the terms which end with digits ...10

FORMULA

a(n) = A085201bi(n,1) = A057164(A072795(A057164(n))) = A057508(A072795(A057508(n))) = A080300(A085224(n))

KEYWORD

nonn

AUTHOR

Antti Karttunen (HisFirstname.HisSurname(AT)iki.fi) Jun 23 2003

STATUS

approved