id:A140453 - OEIS Search Results

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Half the number of n X n binary matrices, symmetric under horizontal and vertical reflection, having equal row sums.

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1, 1, 2, 3, 10, 28, 164, 905, 9826, 103126, 2031252, 43437282, 1622278624, 66141208960, 4579408029576, 385335180349569, 51207103076632066, 8212830157184175946, 2052124795850957537060, 683805150345009276656138 (list; graph; listen)

	OFFSET	`1,3`
	LINKS	`Ron Hardin (rhhardin(AT)att.net), Jul 28 2008, Table of n, a(n) for n = 1..25`
	CROSSREFS	`Sequence in context: A089752 A007029 A099435 this_sequence A037169 A058953 A160909` `Adjacent sequences: A140450 A140451 A140452 this_sequence A140454 A140455 A140456`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Jul 28 2008`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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