id:A107445 - OEIS Search Results

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Number of 4n X 4n alternating-sign matrices of type UU.

+0
2

1, 5, 198, 63206, 163170556, 3410501048325, 577465332522075000, 792313244775191409073200, 8810729389390415079342840510816 (list; graph; listen)

	OFFSET	`0,2`
	LINKS	`G. Kuperberg, Symmetry classes of alternating-sign matrices under one roof, arXiv math.CO/0008184 [A_{UU}(4n)]`
	FORMULA	`Equals A005156(n)*A059489(n).`
	CROSSREFS	`Cf. A005156, A059488, A059493.` `Sequence in context: A142927 A114351 A080927 this_sequence A106990 A128791 A041775` `Adjacent sequences: A107442 A107443 A107444 this_sequence A107446 A107447 A107448`
	KEYWORD	`nonn,easy`
	AUTHOR	`Paul Zinn-Justin (pzinn(AT)lptms.u-psud.fr), May 16 2007, Jun 04 2007`

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Last modified December 4 15:51 EST 2008. Contains 151308 sequences.