A301607 - OEIS

%I #4 Mar 24 2018 11:33:10

%S 1,21,55,755,6393,60841,591585,5880829,58383932,585233819,5854941545,

%T 58759934077,589360075403,5914609427757,59355963113549,

%U 595731234612875,5979121155775603,60011713256358774,602331412174313879

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

%C Column 7 of A301608.

%H R. H. Hardin, <a href="/A301607/b301607.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A301608.

%K nonn

%O 1,2

%A _R. H. Hardin_, Mar 24 2018