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Number of n X n 0..1 arrays with every element equal to 0, 2, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
0

%I #6 Sep 16 2020 18:55:56

%S 1,2,18,10,924,5266,404761,26036557,4110999261,1386699669527

%N Number of n X n 0..1 arrays with every element equal to 0, 2, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

%C Diagonal of A302460.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A302460.

%K nonn

%O 1,2

%A _R. H. Hardin_, Apr 08 2018