id:A050204 - OEIS Search Results

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Number of n X n alternating sign matrices without the restriction that -1's be "bordered" by +1's.

+0
3

1, 2, 21, 1344, 628080 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.`
	CROSSREFS	`Cf. A005130.` `Sequence in context: A015193 A022488 A052157 this_sequence A022470 A080815 A114846` `Adjacent sequences: A050201 A050202 A050203 this_sequence A050205 A050206 A050207`
	KEYWORD	`nonn`
	AUTHOR	`Eric Weisstein (eric(AT)weisstein.com)`

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Last modified July 8 18:40 EDT 2008. Contains 141013 sequences.