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A141441 Number of symmetric n X n integer matrices with adjacent elements differing by no more than 1, counting matrices differing by a constant only once. 1
1, 9, 171, 6939, 609309, 116330103, 48439766655, 44076693953673, 87758086456790325, 382686760306598834367, 3657439086014690607695427, 76650406140131002235613079269, 3523958963105797496154269304608661 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..13.

CROSSREFS

Sequence in context: A238466 A049212 A266856 * A225813 A305465 A027956

Adjacent sequences:  A141438 A141439 A141440 * A141442 A141443 A141444

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 06 2008

STATUS

approved

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Last modified August 18 00:56 EDT 2019. Contains 326059 sequences. (Running on oeis4.)