%I #6 May 03 2020 15:42:42
%S 0,1,4,59,3500,532282,180902016,162145163369,357772266192414
%N Number of n X n 0..1 arrays with every element equal to 2, 3, 4 or 6 king-move adjacent elements, with upper left element zero.
%C Diagonal of A298070.
%e Some solutions for n=5
%e ..0..0..1..0..0. .0..1..1..1..0. .0..1..1..1..1. .0..0..1..1..1
%e ..0..1..1..0..0. .0..0..1..0..0. .0..0..1..0..1. .0..1..0..0..1
%e ..0..0..1..0..1. .0..0..1..0..0. .0..1..0..0..1. .1..1..0..1..0
%e ..1..0..0..1..1. .1..1..0..1..1. .1..1..0..1..1. .1..0..1..0..0
%e ..1..1..1..1..1. .1..0..0..1..1. .1..1..0..0..1. .0..0..1..1..0
%Y Cf. A298070.
%K nonn
%O 1,3
%A _R. H. Hardin_, Jan 11 2018
|