A303801 - OEIS

%I #6 Sep 16 2020 19:08:14

%S 1,5,9,38,100,316,1217,8004,52464,501170,4720512,60221097,817581575

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

%C Diagonal of A303808.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A303808.

%K nonn

%O 1,2

%A _R. H. Hardin_, Apr 30 2018