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Number of nX4 0..1 arrays with exactly n+4-2 having value 1 and no three 1s forming an isosceles triangle.
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%I #3 May 11 2016 15:11:05

%S 4,21,4,8,4,37,8,44,8,44,0,34,4,44,0,48,0,52

%N Number of nX4 0..1 arrays with exactly n+4-2 having value 1 and no three 1s forming an isosceles triangle.

%C Column 4 of A272973.

%e All solutions for n=3

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

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

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

%Y Cf. A272973.

%K nonn

%O 1,1

%A _R. H. Hardin_, May 11 2016