A047943 Number of 8-colorings of an n X n grid, up to rotational symmetry.

1, 8, 1044, 33562880, 70368748374016, 9444732965876730429440, 81129638414606686199388699623424, 44601490397061246283080881278262737180295168, 1569275433846670190958947355821723644654155086251882971136

Offset

0,2

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 = 8.

Crossrefs

Column k=8 of A343095.

Cf. A047937.

Sequence in context: A320981 A316395 A176372 * A089672 A279881 A246114

Adjacent sequences: A047940 A047941 A047942 * A047944 A047945 A047946

Keyword

nonn

Author

Rob Pratt

Extensions

Terms a(8) and beyond from Andrew Howroyd, Apr 14 2021

Status

approved