A296326 - OEIS

%I #4 Dec 10 2017 11:47:18

%S 1,45,278,1677,14691,112235,850404,6660799,51754039,401363520,

%T 3119306759,24239641260,188341349284,1463488096858,11372085577974,

%U 88367785063892,686667612240495,5335806199766372,41462375276685856,322187049424431729

%N Number of nX7 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 neighboring 1s.

%C Column 7 of A296327.

%H R. H. Hardin, <a href="/A296326/b296326.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A296327.

%K nonn

%O 1,2

%A _R. H. Hardin_, Dec 10 2017