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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
OFFSET
1,2
CROSSREFS
Sequence in context: A238466 A049212 A266856 * A225813 A357348 A357345
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 06 2008
STATUS
approved