The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A141444 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing all changes.

A141444

Number of n X n integer matrices, symmetric under 90-degree rotation, with adjacent elements differing by no more than 1, counting matrices differing by a constant only once.
(history; published version)

#5 by Jon E. Schoenfield at Sun Nov 25 12:24:25 EST 2018

STATUS

editing

approved

#4 by Jon E. Schoenfield at Sun Nov 25 12:24:23 EST 2018

NAME

Number of n X n integer matrices, symmetric under 90 -degree rotation, with adjacent elements differing by no more than 1, counting matrices differing by a constant only once.

STATUS

approved

editing

#3 by Russ Cox at Sat Mar 31 12:35:07 EDT 2012

AUTHOR

_R. H. Hardin (rhhardin(AT)att.net), _, Aug 06 2008

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), Aug 06 2008

#1 by N. J. A. Sloane at Fri Jan 09 03:00:00 EST 2009

NAME

Number of n X n integer matrices, symmetric under 90 degree rotation, with adjacent elements differing by no more than 1, counting matrices differing by a constant only once.

DATA

1, 1, 9, 17, 309, 1265, 48927, 435807, 36527739, 709448287, 129684847323, 5504589599263, 2200548059561679, 204460755826652731

OFFSET

1,3

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net), Aug 06 2008

STATUS

approved