A047942 Number of 7-colorings of an n X n grid, up to rotational symmetry.
1, 7, 616, 10092775, 8308234084801, 335267154940213889575, 662932711464913775048175499816, 64230894380264719522488136461023341060807, 304940121908958925034643465916849873749900601574419201, 70938377295002676956115265690779190293441720530070400876280330568007
Offset: 0
Keywords
Links
- Andrew Howroyd, Table of n, a(n) for n = 0..25
Formula
a(n) = (m^(n^2) + 2 m^((n^2 + 3 (n mod 2))/4) + m^((n^2 + (n mod 2))/2))/4, with m = 7.
Extensions
Terms a(8) and beyond from Andrew Howroyd, Apr 14 2021