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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. 0
1, 3, 27, 171, 3267, 44235, 1827981, 53678097, 4829415021, 309226567689, 60771492609849, 8507664353592081, 3659154831341169651, 1121748956533219703391 (list; graph; refs; listen; history; text; internal format)
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

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Last modified July 16 04:26 EDT 2019. Contains 325064 sequences. (Running on oeis4.)