id:A141440 - OEIS Search Results

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Number of n X n integer matrices, symmetric under horizontal reflection, with adjacent elements differing by no more than 1, counting matrices differing by a constant only once.

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1, 3, 121, 771, 317259, 4380445, 18838482047, 567241901289, 25690815631493191, 1691995329032459285, 809857047207692689731131, 116848319343974137914103093, 592161880926391194661929563951461 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Ron Hardin (rhhardin(AT)att.net), Aug 06 2008, Table of n, a(n) for n = 1..18`
	CROSSREFS	`Sequence in context: A114077 A103743 A134230 this_sequence A012569 A078258 A124246` `Adjacent sequences: A141437 A141438 A141439 this_sequence A141441 A141442 A141443`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net), Aug 06 2008`

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Last modified December 2 15:58 EST 2008. Contains 150992 sequences.

AT&T Labs Research