login
Number of nXn 0..1 arrays with every element unequal to 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
0

%I #4 Aug 05 2018 15:54:49

%S 0,1,1,4,14,22,274,676,3242,11126,82244,533332,3119164,25366420,

%T 294184154,2840519658,33041657228,516226778736,8641833554020

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

%C Diagonal of A317741.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A317741.

%K nonn

%O 1,4

%A _R. H. Hardin_, Aug 05 2018