A283789 - OEIS

%I #4 Mar 16 2017 12:26:56

%S 0,272,62303,2510456,112397437,4572654404,169720104148,6107937424212,

%T 212446410870512,7189140953293708,238500703212988750,

%U 7777861431597554114,250042522164507124911,7942472881684283792610,249682369478871376219511

%N Number of 6Xn 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 6 of A283784.

%H R. H. Hardin, <a href="/A283789/b283789.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=3

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

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

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

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

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

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

%Y Cf. A283784.

%K nonn

%O 1,2

%A _R. H. Hardin_, Mar 16 2017