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A221138 Number of n X 7 arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2.

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%I A221138 #5 May 20 2021 14:29:50
%S A221138 32,57121,58132316,75512292025,86907967843320,106295637843093924
%N A221138 Number of n X 7 arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2.
%C A221138 Column 7 of A221139.
%e A221138 Some solutions for n=3
%e A221138 ..0..1..2..2..1..1..1....0..1..2..2..1..1..0....0..1..1..2..1..1..0
%e A221138 ..0..1..2..2..1..2..1....0..1..1..2..2..2..0....0..1..1..2..2..1..0
%e A221138 ..0..1..1..0..0..2..0....0..1..2..1..0..2..0....0..1..2..2..2..1..0
%Y A221138 Cf. A221139.
%K A221138 nonn
%O A221138 1,1
%A A221138 _R. H. Hardin_ Jan 02 2013

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