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Number of 4n X 4n alternating-sign matrices of type UU.
1

%I #12 Jan 16 2021 06:40:57

%S 1,5,198,63206,163170556,3410501048325,577465332522075000,

%T 792313244775191409073200,8810729389390415079342840510816

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

%H G. Kuperberg, <a href="https://arxiv.org/abs/math/0008184">Symmetry classes of alternating-sign matrices under one roof</a>, arXiv:math/0008184 [math.CO], 2000-2001. [A_{UU}(4n)]

%F a(n) = A005156(n)*A059489(n).

%Y Cf. A005156, A059488, A059493.

%K nonn,easy

%O 0,2

%A _Paul Zinn-Justin_, May 16 2007, Jun 04 2007