A305481 - OEIS

%I #4 Jun 02 2018 08:54:14

%S 21,103,125,368,1245,3910,11438,34687,106558,317866,952180,2866802,

%T 8566865,25602599,76565334,228533963,682228237,2036249074,6073671043,

%U 18119697325,54049396886,161180119634,480704637867,1433586580256

%N Number of nX7 0..1 arrays with every element unequal to 0, 1, 3, 6 or 8 king-move adjacent elements, with upper left element zero.

%C Column 7 of A305482.

%H R. H. Hardin, <a href="/A305481/b305481.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A305482.

%K nonn

%O 1,1

%A _R. H. Hardin_, Jun 02 2018