id:A141507 - OEIS Search Results

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

+0
1

1, 2, 1, 5, 7, 49, 93, 1237, 4141, 89949, 498037, 18459425, 173151965, 10776871089, 170022693228, 17856702680623, 475042622997955, 84045266807297263, 3767160477564182682, 1123350438602153100399, 84860275331624989832681, 42642871075536884664453747 (list; graph; listen)

	OFFSET	`0,2`
	CROSSREFS	`Sequence in context: A005297 A014551 A088014 this_sequence A059274 A082635 A166623` `Adjacent sequences: A141504 A141505 A141506 this_sequence A141508 A141509 A141510`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Aug 10 2008`

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

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