id:A139009 - OEIS Search Results

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Number of n X n symmetric binary matrices containing no more than one 1 in any 3 X 3 sub-block.

+0
1

1, 2, 3, 4, 10, 29, 73, 255, 1166, 5371, 29682, 210876, 1671283, 15280803, 171861787, 2259744342, 34374508575, 625277335018, 13461221324518, 338565697760175, 10066909617112085, 354314901636357736, 14658961195961880848 (list; graph; listen)

	OFFSET	`0,2`
	LINKS	`Ron Hardin (rhhardin(AT)att.net), May 31 2008, Table of n, a(n) for n = 0..28`
	CROSSREFS	`Sequence in context: A132446 A123700 A005433 this_sequence A049204 A045924 A068910` `Adjacent sequences: A139006 A139007 A139008 this_sequence A139010 A139011 A139012`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), May 31 2008`

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Last modified December 5 08:23 EST 2009. Contains 170348 sequences.

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