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A283640 Number of 7Xn 0..1 arrays with no 1 equal to more than one of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements. 1

%I

%S 0,2458,203025,8209582,317384829,11651389723,392539665568,

%T 12499158065289,391064828730137,11763799548894544,348148848497732064,

%U 10109926834771861782,289155453391286387579,8172119594621868557289

%N Number of 7Xn 0..1 arrays with no 1 equal to more than one of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements.

%C Row 7 of A283634.

%H R. H. Hardin, <a href="/A283640/b283640.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=2

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

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

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

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

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

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

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

%Y Cf. A283634.

%K nonn

%O 1,2

%A _R. H. Hardin_, Mar 12 2017

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Last modified May 18 23:31 EDT 2022. Contains 353826 sequences. (Running on oeis4.)