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A208462 Number of nX3 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors.

%I A208462 #7 Jul 22 2025 21:22:23
%S A208462 5,198,20746,4150760,1366230232,675203938944,470798015742024,
%T A208462 442649055938121520,542162635236824518416,841853575796382626351008,
%U A208462 1621152906552533388717492544,3801835656372944848040523715264
%N A208462 Number of nX3 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors.
%C A208462 Column 3 of A208466
%H A208462 R. H. Hardin, <a href="/A208462/b208462.txt">Table of n, a(n) for n = 1..92</a>
%e A208462 Some solutions for n=4
%e A208462 ..0..0..0....0..0..0....0..0..1....0..1..0....0..0..0....0..0..0....0..0..0
%e A208462 ..0..1..0....0..1..0....0..0..0....1..0..0....0..1..0....0..1..2....0..1..0
%e A208462 ..0..0..0....0..2..1....0..1..0....0..1..1....0..2..0....1..1..0....0..0..2
%e A208462 ..0..1..2....0..0..0....0..0..0....1..2..0....0..0..0....0..0..0....0..0..0
%K A208462 nonn
%O A208462 1,1
%A A208462 _R. H. Hardin_ Feb 27 2012