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

%I #4 Jan 07 2018 11:01:24

%S 0,54,820,5774,174970,3740362,76517448,1699781649,36000744495,

%T 782045113085,16877012899377,363771158498502,7861206400229573,

%U 169677704706722960,3663241783403069590,79092902173616439078

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

%C Column 7 of A297866.

%H R. H. Hardin, <a href="/A297865/b297865.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A297866.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jan 07 2018