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A215901 Number of diagonal and antidiagonal neighbor colorings of the even squares of an nX5 array with new integer colors introduced in row major order.

%I A215901 #6 Jul 22 2025 23:27:15
%S A215901 5,15,726,12840,2387217,87852626,37060769357,2227156082842,
%T A215901 1701536105684377,148049849095504726,180712665575010594347,
%U A215901 21183598567292002167082,38119060864386172887309827
%N A215901 Number of diagonal and antidiagonal neighbor colorings of the even squares of an nX5 array with new integer colors introduced in row major order.
%C A215901 Column 5 of A215904
%H A215901 R. H. Hardin, <a href="/A215901/b215901.txt">Table of n, a(n) for n = 1..24</a>
%e A215901 Some solutions for n=3
%e A215901 ..0..x..1..x..2....0..x..1..x..2....0..x..1..x..1....0..x..1..x..2
%e A215901 ..x..3..x..3..x....x..3..x..4..x....x..2..x..2..x....x..3..x..4..x
%e A215901 ..2..x..2..x..2....5..x..6..x..5....3..x..4..x..3....0..x..2..x..3
%K A215901 nonn
%O A215901 1,1
%A A215901 _R. H. Hardin_ Aug 26 2012