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A216458 Number of horizontal, diagonal and antidiagonal neighbor colorings of the even squares of an nX5 array with new integer colors introduced in row major order.

%I A216458 #6 Jul 22 2025 23:31:58
%S A216458 2,5,203,3429,580479,20880505,8195008751,484968748793,348950573407587,
%T A216458 30012936243058237,34789578208577116867,4040674235335081456861,
%U A216458 6947043903258606579346103,1037627124289198371293601937
%N A216458 Number of horizontal, diagonal and antidiagonal neighbor colorings of the even squares of an nX5 array with new integer colors introduced in row major order.
%C A216458 Column 5 of A216460
%H A216458 R. H. Hardin, <a href="/A216458/b216458.txt">Table of n, a(n) for n = 1..24</a>
%e A216458 Some solutions for n=4
%e A216458 ..0..x..1..x..2....0..x..1..x..2....0..x..1..x..2....0..x..1..x..2
%e A216458 ..x..3..x..4..x....x..2..x..3..x....x..3..x..0..x....x..3..x..0..x
%e A216458 ..0..x..2..x..5....3..x..1..x..0....4..x..1..x..5....2..x..1..x..3
%e A216458 ..x..3..x..0..x....x..0..x..4..x....x..0..x..6..x....x..4..x..0..x
%K A216458 nonn
%O A216458 1,1
%A A216458 _R. H. Hardin_ Sep 07 2012