id:A141510 - OEIS Search Results

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Number of n X n binary matrices, symmetric under horizontal and vertical reflection, with no more than 3 ones in any 2 X 2 subblock.

+0
1

1, 2, 1, 15, 8, 417, 135, 42176, 10425, 15701273, 2699264, 21418970801, 2653515137, 107224417436160, 9445766123241, 1968910887183791359, 123951426556200960, 132633131268024896655873, 5955955433730968860975 (list; graph; listen)

	OFFSET	`0,2`
	LINKS	`Ron Hardin (rhhardin(AT)att.net), Aug 10 2008, Table of n, a(n) for n = 0..30`
	CROSSREFS	`Sequence in context: A124026 A106204 A083074 this_sequence A039652 A012894 A013076` `Adjacent sequences: A141507 A141508 A141509 this_sequence A141511 A141512 A141513`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Aug 10 2008`

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Last modified December 19 12:50 EST 2009. Contains 171053 sequences.

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