id:A139007 - OEIS Search Results

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Number of n X n symmetric binary matrices containing no more than two 1s in any 2 X 2 sub-block.

+0
1

1, 2, 5, 25, 205, 2849, 66677, 2633485, 175143651, 19638725775, 3710411382331, 1181447019186469, 633957805831439213, 573281808520220290885, 873645764409736229092874, 2243689725607702437916265557 (list; graph; listen)

	OFFSET	`0,2`
	LINKS	`Ron Hardin (rhhardin(AT)att.net), May 31 2008, Table of n, a(n) for n = 0..20`
	CROSSREFS	`Sequence in context: A015957 A074417 A049650 this_sequence A015486 A120767 A051771` `Adjacent sequences: A139004 A139005 A139006 this_sequence A139008 A139009 A139010`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), May 31 2008`

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Last modified December 21 10:15 EST 2009. Contains 171081 sequences.

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