A304591 - OEIS

%I #6 Sep 16 2020 19:16:51

%S 0,7,82,3789,316549,57480334,23762003978,21969407257111,

%T 43780987662816536

%N Number of n X n 0..1 arrays with every element unequal to 1, 2, 3, 4 or 6 king-move adjacent elements, with upper left element zero.

%C Diagonal of A304597.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A304597.

%K nonn

%O 1,2

%A _R. H. Hardin_, May 15 2018