id:A141506 - OEIS Search Results

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

+0
1

1, 2, 1, 5, 3, 25, 13, 205, 99, 2849, 1247, 66677, 26615, 2633485, 954340, 175143651, 57733315, 19638725775, 5882854746, 3710411382331, 1010373532123, 1181447019186469, 292421578705864, 633957805831439213, 142628031886778979 (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: A114901 A113178 A108362 this_sequence A056242 A128718 A112358` `Adjacent sequences: A141503 A141504 A141505 this_sequence A141507 A141508 A141509`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Aug 10 2008`

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

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