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Number of nX7 0..1 arrays with every element unequal to 0, 1, 3, 4 or 7 king-move adjacent elements, with upper left element zero.
1

%I #4 May 19 2018 12:34:15

%S 21,127,91,264,731,2073,6750,23642,80209,281982,1002046,3608377,

%T 12962477,46720095,168772741,610745581,2209961264,8001134385,

%U 28984697206,105018572887,380523339190,1378930510442,4997467621045,18112318334850

%N Number of nX7 0..1 arrays with every element unequal to 0, 1, 3, 4 or 7 king-move adjacent elements, with upper left element zero.

%C Column 7 of A304855.

%H R. H. Hardin, <a href="/A304854/b304854.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A304855.

%K nonn

%O 1,1

%A _R. H. Hardin_, May 19 2018