A300688 - OEIS

%I #4 Mar 11 2018 08:50:35

%S 8,981,37100,1242620,42006289,1431755828,48809162176,1662541314220,

%T 56619912876077,1928366919064951,65677923512122208,

%U 2236900077280881002,76185693577077136760,2594778452806336608700,88374539564630929465907

%N Number of nX7 0..1 arrays with every element equal to 1, 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

%C Column 7 of A300689.

%H R. H. Hardin, <a href="/A300688/b300688.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A300689.

%K nonn

%O 1,1

%A _R. H. Hardin_, Mar 11 2018