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A047940 Number of 5-colorings of an n X n grid, up to rotational symmetry. 3

%I #9 Apr 14 2021 22:27:57

%S 1,5,165,489125,38147070625,74505806274453125,

%T 3637978807092666626953125,4440892098500626236200333251953125,

%U 135525271560688054250937420874834136962890625,103397576569128459358926086520114040467888355255126953125

%N Number of 5-colorings of an n X n grid, up to rotational symmetry.

%H Andrew Howroyd, <a href="/A047940/b047940.txt">Table of n, a(n) for n = 0..25</a>

%F a(n) = (m^(n^2) + 2 m^((n^2 + 3 (n mod 2))/4) + m^((n^2 + (n mod 2))/2))/4, with m = 5.

%Y Column k=5 of A343095.

%Y Cf. A054752, A047937.

%K nonn

%O 0,2

%A _Rob Pratt_

%E Terms a(9) and beyond from _Andrew Howroyd_, Apr 14 2021

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Last modified March 28 00:43 EDT 2024. Contains 371235 sequences. (Running on oeis4.)