A299555 - OEIS

%I #6 Jun 15 2020 14:45:47

%S 1,5,5,34,348,4315,88551,2753155,124402861,8271451947

%N Number of n X n 0..1 arrays with every element equal to 0, 2, 3, 5, 7 or 8 king-move adjacent elements, with upper left element zero.

%C Diagonal of A299561.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A299561.

%K nonn

%O 1,2

%A _R. H. Hardin_, Feb 12 2018