A145241 - OEIS

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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.

1, 3, 27, 189, 3969, 64827, 3179169, 121272795, 13891861179, 1237840901829, 331231632520635, 68946329439933309, 43098014529769439457, 20956433266778185286019, 30601694853748262964093129 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	LINKS	`Table of n, a(n) for n=1..15.`
	CROSSREFS	`Sequence in context: A124813 A127220 A127222 * A118996 A043023 A198686` `Adjacent sequences: A145238 A145239 A145240 * A145242 A145243 A145244`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin, Oct 05 2008`
	STATUS	`approved`

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Last modified May 18 15:48 EDT 2013. Contains 225422 sequences.