%I #6 May 03 2020 15:40:17
%S 0,4,109,4771,575754,173216147,127727388127,234129105357081,
%T 1063459512165657876
%N Number of n X n 0..1 arrays with every element equal to 1, 2, 3 or 4 king-move adjacent elements, with upper left element zero.
%C Diagonal of A297923.
%e Some solutions for n=4
%e ..0..1..0..0. .0..1..1..1. .0..1..1..1. .0..0..1..0. .0..0..1..0
%e ..1..0..1..0. .0..0..0..0. .0..0..0..0. .1..1..0..0. .0..0..1..0
%e ..0..1..0..1. .1..1..1..1. .0..1..1..0. .0..1..0..1. .0..1..1..0
%e ..0..1..0..1. .0..0..1..1. .0..1..0..0. .1..0..0..1. .1..1..0..0
%Y Cf. A297923.
%K nonn
%O 1,2
%A _R. H. Hardin_, Jan 08 2018