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Number of n X n 0..1 arrays with every element equal to 2, 3, 4, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
0

%I #6 Jun 15 2020 15:08:01

%S 0,1,9,268,50419,30129628,73267622156,659976048146316,

%T 22262408061891336825,2806394212540208168079006

%N Number of n X n 0..1 arrays with every element equal to 2, 3, 4, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

%C Diagonal of A300175.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A300175.

%K nonn

%O 1,3

%A _R. H. Hardin_, Feb 27 2018