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A141445 Number of n X n integer matrices, symmetric under 180 degree rotation, with adjacent elements differing by no more than 1, counting matrices differing by a constant only once. 0
1, 3, 45, 597, 42787, 2695803, 923529659, 278451121903, 457744547778601, 663065487350675885 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..10.

CROSSREFS

Sequence in context: A060242 A271236 A270064 * A076140 A131568 A287031

Adjacent sequences:  A141442 A141443 A141444 * A141446 A141447 A141448

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 06 2008

STATUS

approved

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Last modified June 25 10:10 EDT 2019. Contains 324351 sequences. (Running on oeis4.)