A278170 - OEIS

A278170

Number of n X n 0..1 arrays with every element both equal and not equal to some elements at offset (-1,0) (-1,1) (0,-1) (0,1) (1,-1) or (1,0), with upper left element zero.

%I #7 Apr 19 2020 23:50:49

%S 0,2,18,1476,396024,408355632,1580935773900,23184238421031934,

%T 1286347795694708130944,270105371559062140434880346,

%U 214634588261090465589376419637454

%N Number of n X n 0..1 arrays with every element both equal and not equal to some elements at offset (-1,0) (-1,1) (0,-1) (0,1) (1,-1) or (1,0), with upper left element zero.

%C Diagonal of A278177.

%H R. H. Hardin, <a href="/A278170/b278170.txt">Table of n, a(n) for n = 1..12</a>

%e Some solutions for n=4

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

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

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

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

%Y Cf. A278177.

%K nonn

%O 1,2

%A _R. H. Hardin_, Nov 13 2016