id:A140984 - OEIS Search Results

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Half the number of n X n binary matrices, symmetric under 180 degree rotation, having equal row sums.

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1, 2, 4, 35, 226, 7592, 156752, 22458249, 1718157826, 941605438142, 250228936146872, 572800408273738658, 580834777459374862880, 5136409738603278958315040, 18792196647668946085817284928 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Ron Hardin (rhhardin(AT)att.net), Jul 28 2008, Table of n, a(n) for n = 1..25`
	CROSSREFS	`Sequence in context: A103625 A006989 A132529 this_sequence A057996 A009090 A009295` `Adjacent sequences: A140981 A140982 A140983 this_sequence A140985 A140986 A140987`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Jul 28 2008`

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Last modified December 6 13:45 EST 2009. Contains 170429 sequences.

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