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%I #6 Jun 15 2020 14:48:24
%S 0,4,48,466,5125,75970,1284100,30465069,1069988410,50612692651,
%T 3442371498953
%N Number of n X n 0..1 arrays with every element equal to 1, 2, 3, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
%C Diagonal of A299607.
%e Some solutions for n=6
%e ..0..0..1..0..0..0. .0..0..0..1..1..0. .0..1..0..1..1..0. .0..0..1..0..0..0
%e ..1..1..1..1..1..0. .0..1..1..1..0..1. .1..0..1..1..0..1. .1..1..1..1..1..0
%e ..1..1..1..1..1..0. .0..1..1..1..1..1. .0..1..1..1..1..0. .1..1..1..1..1..0
%e ..0..0..1..1..1..1. .1..1..1..1..0..1. .1..1..1..1..1..1. .0..0..1..1..1..1
%e ..0..1..0..1..1..0. .0..1..1..0..1..0. .1..0..1..1..1..0. .1..1..0..1..1..0
%e ..1..0..0..1..1..0. .0..1..1..0..0..1. .0..1..0..1..0..1. .0..0..0..1..1..0
%Y Cf. A299607.
%K nonn
%O 1,2
%A _R. H. Hardin_, Feb 14 2018