A297437 - OEIS

%I #4 Dec 30 2017 07:08:15

%S 1,13,320,1085,5108,50127,431723,2741816,19713343,158831909,

%T 1226649472,9140274733,69805274732,540678554646,4154873500103,

%U 31813469310773,244579087519367,1883206579435015,14482216168483555,111339711139069346

%N Number of 7Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 neighboring 1s.

%C Row 7 of A297431.

%H R. H. Hardin, <a href="/A297437/b297437.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

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

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

%Y Cf. A297431.

%K nonn

%O 1,2

%A _R. H. Hardin_, Dec 30 2017