%I #6 May 03 2020 15:43:52
%S 0,1,0,10,88,917,14422,467043,17828062,1081228309
%N Number of n X n 0..1 arrays with every element equal to 2, 3, 5 or 7 king-move adjacent elements, with upper left element zero.
%C Diagonal of A298139.
%e Some solutions for n=7
%e ..0..0..1..1..1..0..0. .0..0..0..0..0..0..0. .0..0..1..0..0..0..1
%e ..0..1..0..1..0..0..1. .0..1..1..1..1..1..0. .0..1..1..1..0..1..1
%e ..1..0..0..1..1..1..1. .1..0..0..0..0..0..1. .0..1..0..1..0..0..1
%e ..1..1..1..0..0..0..0. .0..1..1..1..1..0..1. .0..1..0..0..1..1..0
%e ..1..0..1..0..1..1..0. .1..0..0..0..0..1..1. .0..1..0..1..0..0..0
%e ..0..0..1..0..1..0..1. .0..1..1..1..1..1..0. .0..1..0..1..0..1..0
%e ..0..1..1..0..0..1..1. .0..0..0..0..0..0..0. .0..0..1..0..1..1..1
%Y Cf. A298139.
%K nonn
%O 1,4
%A _R. H. Hardin_, Jan 13 2018
|