A283633 - OEIS

A283633

Number of nX7 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.

%I #4 Mar 12 2017 14:32:14

%S 13,2076,127635,6345928,272974255,10666178322,392539665568,

%T 13797245749346,468742166961530,15502521715119538,501795715376231851,

%U 15957781722597713676,500040694917490469472,15473893797643876157146

%N Number of nX7 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 Column 7 of A283634.

%H R. H. Hardin, <a href="/A283633/b283633.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=3

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

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

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

%Y Cf. A283634.

%K nonn

%O 1,1

%A _R. H. Hardin_, Mar 12 2017