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%I #5 Dec 18 2015 18:18:54
%S 1,2,0,2908,11746590,0,618833411493090,220650208129805684
%N Number of n X n 0..n*n-1 arrays with upper left zero and lower right n*n-1 and each element differing from its horizontal, vertical and antidiagonal neighbors by a power of two.
%C Diagonal of A265601.
%e Some solutions for n=4
%e ..0..8..7..6....0..4..8..9....0..4..8.12....0..4..8..9....0..4..5..9
%e ..4..6..8..7....8..6..7..8....8.12.10.11....8..6..7.11....2..6..7.11
%e ..8.10..9.11...10..8..9..7...10..8.12.13...10..8..9.13....4..8..9.13
%e .12.11.13.15...12.10.11.15....6.10.14.15....9..7.11.15....6.10.11.15
%Y Cf. A265601.
%K nonn
%O 1,2
%A _R. H. Hardin_, Dec 10 2015
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