%I #6 Jun 15 2020 11:11:00
%S 0,4,109,4771,575754,173576070,128132389259,235203378815314,
%T 1070188767920257936
%N Number of n X n 0..1 arrays with every element equal to 1, 2, 3, 4 or 7 king-move adjacent elements, with upper left element zero.
%C Diagonal of A298547.
%e Some solutions for n=5
%e ..0..0..0..1..1. .0..0..0..1..1. .0..0..0..1..1. .0..0..0..1..1
%e ..1..1..0..1..0. .1..1..0..1..0. .1..1..0..1..0. .1..1..0..1..0
%e ..1..1..0..1..0. .0..0..1..0..0. .0..1..0..0..1. .0..0..1..0..0
%e ..1..0..0..1..0. .1..0..0..1..1. .1..0..0..1..1. .0..1..1..0..1
%e ..1..0..1..0..1. .1..1..1..0..0. .1..1..0..1..1. .1..1..0..1..1
%Y Cf. A298547.
%K nonn
%O 1,2
%A _R. H. Hardin_, Jan 21 2018