id:A000513 - OEIS Search Results

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Number of equivalence classes of n X n matrices over {0,1} with rows and columns summing to 4, where equivalence is defined by row and column permutations. Isomorphism classes of bicolored quartic bipartite graphs, where isomorphism cannot exchange the colors.

+0
4

0, 0, 0, 1, 1, 4, 16, 194, 3529, 121790, 5582612 (list; graph; listen)

	OFFSET	`0,6`
	COMMENT	`a(n) is a function of the subfactorials A000166(n) with ofset 0 for n>1 a(n) =(nA000166(n+1) - (n+1)A000166(n)) / (2n(n-1)(n+1)) [From Gary Detlefs (gdetlefs(AT)aol.com), Aug 04 2009]`
	LINKS	`Index entries for sequences related to Latin squares and rectangles`
	CROSSREFS	`Cf. A000512.` `Sequence in context: A033911 A012916 A012921 this_sequence A088027 A113905 A099202` `Adjacent sequences: A000510 A000511 A000512 this_sequence A000514 A000515 A000516`
	KEYWORD	`nonn`
	AUTHOR	`Eric Rogoyski`
	EXTENSIONS	`Definition corrected by Brendan McKay (bdm(AT)cs.anu.edu.au), May 28 2006`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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