id:A141513 - OEIS Search Results

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Number of n X n binary matrices, symmetric under 90 degree rotation, with no more than 3 ones in any 2 X 2 subblock.

+0
1

1, 2, 1, 7, 8, 101, 207, 5120, 20417, 961969, 7321136, 661511545, 9650955373, 1669696876968, 46646811310045, 15458287165896835, 827194455797432320, 525025121630724209885, 53809855627730048960875 (list; graph; listen)

	OFFSET	`0,2`
	LINKS	`Ron Hardin (rhhardin(AT)att.net), Aug 10 2008, Table of n, a(n) for n = 0..25`
	CROSSREFS	`Sequence in context: A144749 A021463 A111479 this_sequence A102817 A026252 A032298` `Adjacent sequences: A141510 A141511 A141512 this_sequence A141514 A141515 A141516`
	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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