A299669 - OEIS

%I #6 Jun 15 2020 14:51:10

%S 1,8,94,2009,131420,17105490,4670821739,3777344294506,6940995630452984

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

%C Diagonal of A299675.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A299675.

%K nonn

%O 1,2

%A _R. H. Hardin_, Feb 16 2018