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Search: id:A145241
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A145241 1/4 of the number of 4-colorings of an n X n array symmetric about both diagonal and antidiagonal. +0
1
1, 3, 27, 189, 3969, 64827, 3179169, 121272795, 13891861179, 1237840901829, 331231632520635, 68946329439933309, 43098014529769439457, 20956433266778185286019, 30601694853748262964093129 (list; graph; listen)
OFFSET

1,2
CROSSREFS

Sequence in context: A124813 A127220 A127222 this_sequence A118996 A043023 A087426

Adjacent sequences: A145238 A145239 A145240 this_sequence A145242 A145243 A145244

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net), Oct 05 2008

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

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