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%I #6 Apr 25 2023 13:55:58
%S 1,0,36,0,0,2506,294152,0,19516777,83909226,0,10678005713,
%T 545032909689,0,102275177508104,395694498744634,0,81469369938066316,
%U 2375486573786293387,0,404350295447676882458,3081651598084594364137,0
%N Number of n X 3 0..n*3-1 arrays with upper left zero and lower right n*3-1 and each element differing from its horizontal, vertical and diagonal neighbors by a power of two.
%C Column 3 of A265494.
%H R. H. Hardin, <a href="/A265489/b265489.txt">Table of n, a(n) for n = 1..135</a>
%e Some solutions for n=6
%e ..0..2.10....0..8..4....0..2..4....0..8..4....0..2.10....0..8.10....0..8.10
%e ..2..4..6....8.16.12....8..4..0....8..4..0....2..4..6....8.16.12....8.16.12
%e ..4..3..5...10.12..8...16.12..8....7..6..8....1..3..2...16.12..8...10.12.14
%e ..3..5..7....9.11.10...15.14.16....9..5..7....9..5..1...15.14.16...12.11.10
%e ..5..1..9...17.13..9...17.13.15...17.13..9...17.13..9...11.13.15...11.13..9
%e ..1..9.17...13..9.17...13.15.17...13..9.17....1..9.17....7.15.17....7..9.17
%Y Cf. A265494.
%K nonn
%O 1,3
%A _R. H. Hardin_, Dec 09 2015
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