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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. 0
1, 1, 9, 17, 309, 1265, 48927, 435807, 36527739, 709448287, 129684847323, 5504589599263, 2200548059561679, 204460755826652731 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..14.

CROSSREFS

Sequence in context: A132375 A110360 A123836 * A061748 A159510 A191675

Adjacent sequences:  A141441 A141442 A141443 * A141445 A141446 A141447

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 06 2008

STATUS

approved

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Last modified July 23 11:44 EDT 2019. Contains 325254 sequences. (Running on oeis4.)