A298576 - OEIS

%I #6 Jun 15 2020 11:19:05

%S 0,3,15,78,765,16521,708805,40964223,4776371282,1079598223972

%N Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero.

%C Diagonal of A298582.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A298582.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jan 22 2018