login
Number of n X n 0..1 arrays with every element equal to 1, 2, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
0

%I #6 Sep 16 2020 18:57:03

%S 0,3,28,168,3683,182773,16130212,1916999716,305442540368

%N Number of n X n 0..1 arrays with every element equal to 1, 2, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

%C Diagonal of A302528.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A302528.

%K nonn

%O 1,2

%A _R. H. Hardin_, Apr 09 2018