A304849 - OEIS

%I #6 Oct 20 2020 19:28:08

%S 1,5,9,38,148,762,6750,97917,1725334,42688289,1433354938

%N Number of n X n 0..1 arrays with every element unequal to 0, 1, 3, 4 or 7 king-move adjacent elements, with upper left element zero.

%C Diagonal of A304855.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A304855.

%K nonn

%O 1,2

%A _R. H. Hardin_, May 19 2018