A305684 - OEIS

%I #4 Jun 08 2018 08:08:55

%S 1,908,29339,2403703,185389115,14724197226,1172824606532,

%T 93679147557172,7488807032051960,598902694841380350,

%U 47903727320863846345,3831871282738890360162,306523980297786519252964

%N Number of nX7 0..1 arrays with every element unequal to 0, 2, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero.

%C Column 7 of A305685.

%H R. H. Hardin, <a href="/A305684/b305684.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..1..0..1..0..1. .0..0..1..1..0..0..0

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

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

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

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

%Y Cf. A305685.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jun 08 2018