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Number of 4Xn 0..1 arrays with no 1 equal to more than two of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements.
1

%I #4 Mar 16 2017 12:25:03

%S 0,6,745,10910,169426,2343698,30330979,378503754,4556569689,

%T 53546828856,616835993268,6986404201564,78056748854477,

%U 861930295108488,9421882830360686,102095122727276740,1097818076307591942

%N Number of 4Xn 0..1 arrays with no 1 equal to more than two of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements.

%C Row 4 of A283784.

%H R. H. Hardin, <a href="/A283787/b283787.txt">Table of n, a(n) for n = 1..210</a>

%H R. H. Hardin, <a href="/A283787/a283787.txt">Empirical recurrence of order 69</a>

%F Empirical recurrence of order 69 (see link above)

%e Some solutions for n=4

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

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

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

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

%Y Cf. A283784.

%K nonn

%O 1,2

%A _R. H. Hardin_, Mar 16 2017