id:A141485 - OEIS Search Results

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Number of n X n binary matrices, symmetric about both diagonal and antidiagonal, with no more than 1 one in any 2 X 2 subblock.

+0
1

1, 2, 1, 5, 4, 21, 21, 158, 225, 2181, 4032, 53517, 135895, 2389270, 8052775, 191382781, 871834816, 27710789575, 168906089337, 7222686132766, 59221019073815, 3396328221185505, 37352381844672086, 2877824684844515547 (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: A120924 A079285 A124660 this_sequence A005605 A145882 A111785` `Adjacent sequences: A141482 A141483 A141484 this_sequence A141486 A141487 A141488`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Aug 09 2008`

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

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