A300103 - OEIS

%I #6 Jun 15 2020 15:06:42

%S 0,4,57,1041,59014,7603542,1781758380,1206489116900,2190341526343270

%N Number of n X n 0..1 arrays with every element equal to 1, 2, 3, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

%C Diagonal of A300108.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A300108.

%K nonn

%O 1,2

%A _R. H. Hardin_, Feb 25 2018