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Number of nX7 0..1 arrays with no 1 equal to more than two of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly one element.
1

%I #4 Mar 15 2017 08:02:24

%S 0,4220,369328,25260000,1590274565,94357463834,5410290101514,

%T 302490564406270,16600142770401845,897968848303855396,

%U 48020384269733267214,2544060241155707255130,133737173204786854881261

%N Number of nX7 0..1 arrays with no 1 equal to more than two of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly one element.

%C Column 7 of A283726.

%H R. H. Hardin, <a href="/A283725/b283725.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=2

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

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

%Y Cf. A283726.

%K nonn

%O 1,2

%A _R. H. Hardin_, Mar 15 2017