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 A207979 Number of nX3 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any diagonal or antidiagonal neighbor (colorings ignoring permutations of colors) 1

%I

%S 5,67,4192,587208,147512732,58668937932,34119101220224,

%T 27451586022436696,29334574202437277520,40343697156563884675488,

%U 69646199705725564208484736,147875840329637502384856552096,379682313150983568999164195148800

%N Number of nX3 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any diagonal or antidiagonal neighbor (colorings ignoring permutations of colors)

%C Column 3 of A207981

%H R. H. Hardin, <a href="/A207979/b207979.txt">Table of n, a(n) for n = 1..16</a>

%e Some solutions for n=4

%e ..0..0..0....0..0..0....0..0..1....0..0..0....0..0..0....0..0..0....0..1..0

%e ..1..1..1....1..1..1....1..2..1....1..1..2....1..1..1....1..2..1....2..1..0

%e ..0..2..2....2..0..2....1..2..0....2..0..0....0..2..0....0..0..0....0..1..3

%e ..1..1..0....1..0..1....0..2..0....3..1..4....1..1..0....2..1..1....0..4..0

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 22 2012

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Last modified June 28 08:51 EDT 2022. Contains 354903 sequences. (Running on oeis4.)