id:A059476 - OEIS Search Results

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Number of 4n X 4n quarter-turn symmetric alternating-sign matrices (QTSASM's).

+0
2

1, 2, 40, 6860, 9779616, 114640611228, 10995014015567296, 8604220484134405095680, 54849585336544518476372715520, 2845241019832977820277705514596768000, 1200139922362764777157943140382976769515000000 (list; graph; listen)

	OFFSET	`0,2`
	LINKS	`G. Kuperberg, Symmetry classes of alternating-sign matrices under one roof, arXiv math.CO/0008184`
	FORMULA	`A059475(n)*A005130(n)^2.`
	CROSSREFS	`Sequence in context: A060079 A052502 A104134 this_sequence A062769 A033841 A107194` `Adjacent sequences: A059473 A059474 A059475 this_sequence A059477 A059478 A059479`
	KEYWORD	`nonn`
	AUTHOR	`njas, Feb 04 2001`

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

AT&T Labs Research