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%I #7 Oct 20 2014 17:15:16
%S 1,1,30,4410,1837080,1660289400,2778905329200,7757931431250000,
%T 33536835305077104000,212373276256391153904000,
%U 1887114765997607482496160000,22736049196010108202227823840000,361148501823912048339843750000000000,7389146090843722060953495522716592000000,190939093198813987007780146685866111584000000
%N (2*n)!*((2*n+1)/2)^n/(2*n+1).
%H Thorsten Weist, <a href="http://arxiv.org/abs/1203.2740">On the Euler characteristic of Kronecker moduli spaces</a>, arXiv preprint arXiv:1203.2740, 2012. Cor. 5.3, k=2.
%K nonn
%O 0,3
%A _N. J. A. Sloane_, Sep 16 2012