cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A381326 Number of (undirected) Hamiltonian cycles in the complete 4-partite graph K_{n,n,n,n}.

Original entry on oeis.org

3, 744, 1833840, 18872165376, 553245728256000, 37106744352952320000, 4936487939183251906560000, 1177983332748595472891904000000, 467912746454054494167896413962240000, 292026962339084784352431710907924480000000, 273498538086199515052362271809542396313600000000
Offset: 1

Views

Author

Eric W. Weisstein, Feb 20 2025

Keywords

Crossrefs

Cf. A378241 (directed Hamiltonian cycles).

Programs

  • Mathematica
    Table[(n!)^4 Expand[Hypergeometric1F1[1 - n, 2, x]^4 x^3] /. x^p_ :> p!, {n, 11}]/2

Formula

a(n) = A378241(n)/2.
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