A370845 a(n) = (n-2)^n*n!.

-1, 0, 6, 384, 29160, 2949120, 393750000, 67722117120, 14643516908160, 3896394330931200, 1252631480200531200, 479001600000000000000, 214973646592670930764800, 111929817779497742421196800

Offset

1,3

Comments

For n > 2, a(n) is the number of minimum vertex colorings of the n-sun graph.

Links

Table of n, a(n) for n=1..14.

Eric Weisstein's World of Mathematics, Minimum Vertex Coloring.

Eric Weisstein's World of Mathematics, Sun Graph.

Mathematica

Table[(n - 2)^n n!, {n, 20}]

Crossrefs

Sequence in context: A078207 A261296 A060871 * A193133 A162137 A119645

Adjacent sequences: A370842 A370843 A370844 * A370846 A370847 A370848

Keyword

sign,easy

Author

Eric W. Weisstein, Mar 03 2024

Status

approved