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, 9, 171, 6939, 609309, 116330103, 48439766655, 44076693953673, 87758086456790325, 382686760306598834367, 3657439086014690607695427, 76650406140131002235613079269, 3523958963105797496154269304608661

Offset

1,2

Links

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

Crossrefs

Sequence in context: A238466 A049212 A266856 * A225813 A357348 A357345

Adjacent sequences: A141438 A141439 A141440 * A141442 A141443 A141444

Keyword

nonn

Author

R. H. Hardin, Aug 06 2008

Status

approved