A304895 - OEIS

%I #6 Oct 20 2020 19:28:54

%S 0,7,62,2373,107723,11067544,2256313057,816589152784,612719659755750

%N Number of n X n 0..1 arrays with every element unequal to 1, 2, 3, 4 or 7 king-move adjacent elements, with upper left element zero.

%C Diagonal of A304901.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A304901.

%K nonn

%O 1,2

%A _R. H. Hardin_, May 20 2018