A305505 - OEIS

%I #4 Jun 03 2018 13:06:01

%S 0,3,4,346,13314,1126154,235231504,93092873891,74276306711509

%N Number of nXn 0..1 arrays with every element unequal to 2, 3, 4, 6 or 8 king-move adjacent elements, with upper left element zero.

%C Diagonal of A305509.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A305509.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jun 03 2018