id:A140217 - OEIS Search Results

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

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1, 1, 2, 9, 34, 730, 4376, 905345, 10601986, 10009765626, 200097656252, 2177748514672962, 85812416258106784, 4142789042980129347156, 289904403212517959978240, 175519033940460517461369847809 (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: A150943 A150944 A151308 this_sequence A032601 A083141 A001571` `Adjacent sequences: A140214 A140215 A140216 this_sequence A140218 A140219 A140220`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Jul 28 2008`

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Last modified December 17 13:29 EST 2009. Contains 170826 sequences.

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