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

%I #6 Aug 20 2020 11:50:35

%S 0,3,43,934,40395,3420704,553097760,177191137344,102914156897887,

%T 122108799039662692

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

%C Diagonal of A302224.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A302224.

%K nonn

%O 1,2

%A _R. H. Hardin_, Apr 03 2018