%I #6 Jun 15 2020 11:23:25
%S 1,1,3,2,20,169,978,22938,329249,12541065,628713833
%N Number of n X n 0..1 arrays with every element equal to 0, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero.
%C Diagonal of A298667.
%e Some solutions for n=8
%e ..0..0..1..0..0..0..0..1. .0..0..1..0..0..0..0..1. .0..0..0..0..1..0..0..1
%e ..0..0..0..0..1..0..0..0. .0..0..0..0..1..0..0..0. .0..0..1..0..0..0..0..0
%e ..0..1..0..0..0..0..0..1. .0..1..0..0..0..0..0..0. .1..0..0..0..0..0..0..0
%e ..0..0..0..0..1..0..0..0. .0..0..0..0..0..0..1..1. .0..0..0..0..1..0..1..1
%e ..0..1..0..0..0..0..1..0. .0..0..0..1..0..0..1..1. .0..0..1..1..1..1..1..1
%e ..0..0..0..0..0..0..0..0. .0..1..0..0..0..0..0..0. .1..1..1..1..1..1..1..0
%e ..0..0..1..0..0..1..0..0. .0..0..0..0..1..0..0..0. .1..1..1..1..0..1..1..1
%e ..1..0..0..0..0..0..0..1. .0..0..1..0..0..0..0..1. .0..1..0..1..1..1..1..0
%Y Cf. A298667.
%K nonn
%O 1,3
%A _R. H. Hardin_, Jan 24 2018
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