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 A305580 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 7 or 8 king-move adjacent elements, with upper left element zero. 0

%I

%S 1,4,6,15,76,1897,50618,1944635,206386330,39654762470,12122540208729,

%T 7706375033488022,9485494637120246765,20755111336456755801193

%N Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 7 or 8 king-move adjacent elements, with upper left element zero.

%C Diagonal of A305586.

%e Some solutions for n=5

%e ..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..1

%e ..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..1..0

%e ..0..0..0..0..0. .0..1..0..0..0. .0..0..0..0..0. .0..0..0..0..0

%e ..0..0..0..0..0. .0..0..0..0..0. .0..0..0..1..0. .0..1..0..0..0

%e ..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .1..0..0..0..0

%Y Cf. A305586.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jun 05 2018

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Last modified September 25 13:01 EDT 2020. Contains 337344 sequences. (Running on oeis4.)