A320408 - OEIS

%I #4 Oct 12 2018 12:40:13

%S 64,700,7049,92578,1353623,19677729,282206549,4085687781,58997871413,

%T 854291464126,12364136018320,178956311530396,2590922938391319,

%U 37511252836334859,543116212765934101,7863666564278921803

%N Number of nX7 0..1 arrays with every element unequal to 0, 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

%C Column 7 of A320409.

%H R. H. Hardin, <a href="/A320408/b320408.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A320409.

%K nonn

%O 1,1

%A _R. H. Hardin_, Oct 12 2018