id:A141487 - OEIS Search Results

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Number of n X n binary matrices, symmetric under 90 degree rotation, with no more than 1 one in any 2 X 2 subblock.

+0
1

1, 2, 1, 3, 4, 13, 17, 82, 167, 1029, 2594, 22033, 77729, 874498, 4050975, 61638683, 387821570, 7893076251, 66271702355, 1814566347320, 20521356444643, 753627817663469, 11423997447177546, 563598221301212705 (list; graph; listen)

	OFFSET	`0,2`
	LINKS	`Ron Hardin (rhhardin(AT)att.net), Aug 09 2008, Table of n, a(n) for n = 0..30`
	CROSSREFS	`Sequence in context: A052950 A086851 A001054 this_sequence A099866 A085189 A130466` `Adjacent sequences: A141484 A141485 A141486 this_sequence A141488 A141489 A141490`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Aug 09 2008`

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

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