A216728 (2*n)!*((2*n+1)/2)^n/(2*n+1).

1, 1, 30, 4410, 1837080, 1660289400, 2778905329200, 7757931431250000, 33536835305077104000, 212373276256391153904000, 1887114765997607482496160000, 22736049196010108202227823840000, 361148501823912048339843750000000000, 7389146090843722060953495522716592000000, 190939093198813987007780146685866111584000000

Offset

0,3

Links

Table of n, a(n) for n=0..14.

Thorsten Weist, On the Euler characteristic of Kronecker moduli spaces, arXiv preprint arXiv:1203.2740, 2012. Cor. 5.3, k=2.

Crossrefs

Sequence in context: A166845 A166834 A246620 * A196466 A159401 A288033

Adjacent sequences: A216725 A216726 A216727 * A216729 A216730 A216731

Keyword

nonn

Author

N. J. A. Sloane, Sep 16 2012

Status

approved