A289136 Number of colorings of the n X n king graph up to permutation of the colors.

1, 1, 270, 30066912, 3662498214110836, 978788002444637886853083440, 1017523795194980592656592864724960780556190, 6723457445689415320074916040888682277646129463792942126176174

Offset: 1

Author

Andrew Howroyd, Jun 25 2017

Keywords

• nonn

Links

• Jean-François Alcover, Table of n, a(n) for n = 1..11
• Eric Weisstein's World of Mathematics, King Graph

Crossrefs

Main diagonal of A208021.

Cf. A212208, A212209.

Programs

Mathematica

A208021 = Import["https://oeis.org/A208021/b208021.txt", "Table"][[All, 2]];
a[n_] := A208021[[2 n^2 - 2 n + 1]];
Table[a[n], {n, 1, 11}] (* Jean-François Alcover, Sep 23 2019 *)