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A207863 Number of n X n nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal or vertical neighbor (colorings ignoring permutations of colors).

%I A207863 #10 Mar 12 2023 14:18:00
%S A207863 1,4,2052,455546040,103204230192540988,47890666906311937749901098886,
%T A207863 81523212441914346544073433818166292337910075,
%U A207863 839780322234263638551379612300530069754865868713324092842519030,81184462760528172324981018065090176893681709356914242351556151349811667519060498973390
%N A207863 Number of n X n nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal or vertical neighbor (colorings ignoring permutations of colors).
%H A207863 Andrew Howroyd, <a href="/A207863/b207863.txt">Table of n, a(n) for n = 1..11</a>
%e A207863 Some solutions for n=5
%e A207863 ..0..1..0..1..0....0..1..0..1..0....0..1..2..0..1....0..1..0..1..0
%e A207863 ..1..0..1..0..1....1..0..1..0..1....1..0..1..3..0....1..0..1..0..1
%e A207863 ..0..1..0..1..0....2..3..0..1..2....0..1..0..1..2....0..1..0..1..0
%e A207863 ..2..0..1..0..1....0..1..2..0..1....1..0..1..0..1....1..0..1..0..1
%e A207863 ..0..1..0..1..0....1..0..1..4..0....0..1..0..1..0....0..1..0..1..0
%Y A207863 Diagonal of A207868.
%K A207863 nonn
%O A207863 1,2
%A A207863 _R. H. Hardin_, Feb 21 2012
%E A207863 Terms a(6) and beyond from _Andrew Howroyd_, Mar 11 2023