A059493 A005156(n)*A059488(n)^2.

1, 36, 58800, 4350842496, 14616841474819584, 2232275367429083934397440, 15508029030753757178368051489382400, 4903022043055128535359103830176804216217600000, 70564996915837622037116996413540007182305594153356328960000

Offset: 0

Author

N. J. A. Sloane, Feb 04 2001

Keywords

• nonn
• easy

Links

• G. Kuperberg, Symmetry classes of alternating-sign matrices under one roof, arXiv math.CO/0008184 [A_{UU}(4n)]

Crossrefs

Cf. A005156, A059488, A107445.

Extensions

Definition changed by N. J. A. Sloane following a comment by Paul Zinn-Justin (pzinn(AT)lptms.u-psud.fr), May 29 2007