A305686 - OEIS

%I #6 Jan 22 2022 16:22:34

%S 0,7,152,16658,6433903,9226209199,49083436693252,968465070692638039,

%T 70872690892664520015992,19236536201373166716419414330

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

%C Diagonal of A305692.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A305692.

%K nonn,more

%O 1,2

%A _R. H. Hardin_, Jun 08 2018