A299808 - OEIS

%I #6 Jun 15 2020 14:58:55

%S 1,4,12,476,11460,1881856,1009387819,1201130067486,5391490611757566

%N Number of n X n 0..1 arrays with every element equal to 0, 1, 3, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero.

%C Diagonal of A299814.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A299814.

%K nonn

%O 1,2

%A _R. H. Hardin_, Feb 19 2018