A300371 - OEIS

%I #4 Mar 04 2018 09:09:29

%S 0,6,16,39,270,1592,12042,75739,490425,3084820,19634393,129519588,

%T 829432020,5341866361,34667291397,223006749453,1438573920539,

%U 9290258941352,59927615962595,386783857393798,2495707675837699

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

%C Column 7 of A300372.

%H R. H. Hardin, <a href="/A300371/b300371.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..1..1..0. .0..0..0..0..1..1..0

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

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

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

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

%Y Cf. A300372.

%K nonn

%O 1,2

%A _R. H. Hardin_, Mar 04 2018