id:A141505 - OEIS Search Results

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Number of n X n binary matrices, symmetric about both diagonal and antidiagonal, with no more than 2 ones in any 2 X 2 subblock.

+0
1

1, 2, 3, 9, 21, 113, 469, 4085, 28379, 421721, 4946881, 123415785, 2438547133, 102642272877, 3418605422546, 242398759656743, 13604569959521965, 1625856487869820237, 153782502309772183952, 30970307573051859177121, 4936590429632104565792997, 1675450994355334964940357075 (list; graph; listen)

	OFFSET	`0,2`
	CROSSREFS	`Sequence in context: A099607 A077550 A056780 this_sequence A111360 A111238 A057832` `Adjacent sequences: A141502 A141503 A141504 this_sequence A141506 A141507 A141508`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Aug 10 2008`

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Last modified December 2 15:28 EST 2008. Contains 150991 sequences.

AT&T Labs Research