The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A177582

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

Number of permutations of 2 copies of 1..n avoiding adjacent step pattern up, down, down, up, up, up
(history; published version)

#3 by Russ Cox at Sat Mar 31 12:35:44 EDT 2012

AUTHOR

_R. H. Hardin (rhhardin(AT)att.net) _ May 10 2010

Discussion

Sat Mar 31

12:35

OEIS Server: https://oeis.org/edit/global/875

#2 by N. J. A. Sloane at Sat Oct 02 03:00:00 EDT 2010

KEYWORD

nonn,new

nonn

AUTHOR

Ron R. H. Hardin (rhhardin(AT)att.net) May 10 2010

#1 by N. J. A. Sloane at Tue Jun 01 03:00:00 EDT 2010

NAME

Number of permutations of 2 copies of 1..n avoiding adjacent step pattern up, down, down, up, up, up

DATA

1, 6, 90, 2510, 112020, 7307874, 655845094, 77496572328, 11662893335890, 2177988280932500

OFFSET

1,2

KEYWORD

nonn,new

AUTHOR

Ron Hardin (rhhardin(AT)att.net) May 10 2010

STATUS

approved