A304761 - OEIS

%I #6 Oct 20 2020 19:27:12

%S 0,3,16,1321,316639,292676592,969267512820,11630662747620895,

%T 503933308340733338752

%N Number of n X n 0..1 arrays with every element unequal to 2, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero.

%C Diagonal of A304767.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A304767.

%K nonn

%O 1,2

%A _R. H. Hardin_, May 18 2018