id:A059490 - OEIS Search Results

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Expansion of generating function A_{QT}^(1)(4n;2).

+0
1

1, 1, 5, 105, 9009, 3128697, 4379132901, 24645892667825, 556965289746386625, 50494858759761851228625, 18354114596951084500741513125, 26735929307256782047733105984465625, 156023842049488378026019378718492161640625, 3646806710157227756289546514549111188854996015625 (list; graph; listen)

	OFFSET	`0,3`
	LINKS	`G. Kuperberg, Symmetry classes of alternating-sign matrices under one roof, arXiv math.CO/0008184 [Th. 5, but the right-hand side should be multiplied by (-1)^(n*(n-1)/2)]`
	MAPLE	`A059490 := proc(n) local i, j, t1; t1 := (-1)^(n(n-1)/2)2^(2n^2-n); for i to n do for j to n do t1 := t1(4j - 4i + 1)/(j - i + n); end do end do; t1 end proc;`
	CROSSREFS	`Sequence in context: A034225 A114481 A015002 this_sequence A093979 A113056 A048564` `Adjacent sequences: A059487 A059488 A059489 this_sequence A059491 A059492 A059493`
	KEYWORD	`nonn,easy`
	AUTHOR	`njas, Feb 04 2001`

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Last modified July 4 18:25 EDT 2008. Contains 140886 sequences.

AT&T Labs Research