A141442 Number of n X n integer matrices, symmetric about both diagonal and antidiagonal, with adjacent elements differing by no more than 1, counting matrices differing by a constant only once.

1, 3, 27, 171, 3267, 44235, 1827981, 53678097, 4829415021, 309226567689, 60771492609849, 8507664353592081, 3659154831341169651, 1121748956533219703391

Offset

1,2

Links

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

Crossrefs

Sequence in context: A129530 A056370 A056361 * A053932 A027507 A297670

Adjacent sequences: A141439 A141440 A141441 * A141443 A141444 A141445

Keyword

nonn

Author

R. H. Hardin, Aug 06 2008

Status

approved