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Number of n X n 0..1 arrays with every element equal to 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
0

%I #6 Jun 15 2020 15:11:12

%S 0,1,0,3,32,366,12042,729062,70536528,13229207915,4795249162868

%N Number of n X n 0..1 arrays with every element equal to 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

%C Diagonal of A300372.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A300372.

%K nonn

%O 1,4

%A _R. H. Hardin_, Mar 04 2018