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A145252 1/8 of the number of 8-colorings of an n X n array symmetric about both diagonal and antidiagonal. 0
1, 7, 343, 14749, 4439449, 1172648743, 2168231331049, 3518160769178167, 39959916168271359799, 398295912044286028090213, 27789833914848401703684111343 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..11.

CROSSREFS

Sequence in context: A068150 A195803 A263220 * A154024 A013712 A109493

Adjacent sequences:  A145249 A145250 A145251 * A145253 A145254 A145255

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 05 2008

STATUS

approved

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Last modified October 17 21:24 EDT 2018. Contains 316293 sequences. (Running on oeis4.)