id:A141488 - OEIS Search Results

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Number of n X n binary matrices, symmetric under 180 degree rotation, with no more than 1 one in any 2 X 2 subblock.

+0
1

1, 2, 1, 7, 14, 111, 277, 4630, 25913, 702227, 6394908, 326629617, 5687827965, 509730678546, 15540557303649, 2543316661538595, 142034694045640208, 41602235282780689163, 4154045153554082019959, 2201424142622929530965310 (list; graph; listen)

	OFFSET	`0,2`
	LINKS	`Ron Hardin (rhhardin(AT)att.net), Aug 09 2008, Table of n, a(n) for n = 0..24`
	CROSSREFS	`Sequence in context: A075118 A100245 A095137 this_sequence A113042 A013070 A012888` `Adjacent sequences: A141485 A141486 A141487 this_sequence A141489 A141490 A141491`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Aug 09 2008`

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Last modified November 30 22:12 EST 2008. Contains 150989 sequences.

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