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A216728 (2*n)!*((2*n+1)/2)^n/(2*n+1). 0
1, 1, 30, 4410, 1837080, 1660289400, 2778905329200, 7757931431250000, 33536835305077104000, 212373276256391153904000, 1887114765997607482496160000, 22736049196010108202227823840000, 361148501823912048339843750000000000, 7389146090843722060953495522716592000000, 190939093198813987007780146685866111584000000 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 15 18:22 EDT 2019. Contains 327082 sequences. (Running on oeis4.)