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A208200 Number of nX7 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than two of its immediate leftward or upward or left-upward diagonal neighbors.

%I A208200 #7 Jul 22 2025 21:14:38
%S A208200 715,10215440,153402542384,2303673397508915,34594950233928279876,
%T A208200 519522527116810577984260,7801822458198433796561428608,
%U A208200 117162260457319989881048135168019,1759460094015764611132758812387283596
%N A208200 Number of nX7 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than two of its immediate leftward or upward or left-upward diagonal neighbors.
%C A208200 Column 7 of A208201
%H A208200 R. H. Hardin, <a href="/A208200/b208200.txt">Table of n, a(n) for n = 1..210</a>
%e A208200 Some solutions for n=4
%e A208200 ..0..0..0..1..0..1..0....0..1..2..3..0..1..2....0..0..0..0..0..0..0
%e A208200 ..2..2..1..0..3..1..0....0..0..1..3..0..2..0....0..1..0..1..2..3..2
%e A208200 ..1..0..0..0..1..2..0....3..0..2..0..3..1..1....2..0..2..1..0..1..2
%e A208200 ..3..3..0..1..0..1..2....2..0..2..0..1..0..3....1..3..2..1..3..0..3
%K A208200 nonn
%O A208200 1,1
%A A208200 _R. H. Hardin_ Feb 24 2012