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Number of nX7 0..1 arrays with every element equal to 2, 3, 4 or 7 king-move adjacent elements, with upper left element zero.
1

%I #4 Jan 13 2018 10:54:45

%S 0,54,826,5782,175014,3752401,76791444,1706951987,36185741209,

%T 786733395586,16992126182076,366550521559787,7927928295359425,

%U 171260155001322160,3700464812129655258,79963026370989545009

%N Number of nX7 0..1 arrays with every element equal to 2, 3, 4 or 7 king-move adjacent elements, with upper left element zero.

%C Column 7 of A298133.

%H R. H. Hardin, <a href="/A298132/b298132.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A298133.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jan 13 2018