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A221322 Number of n X n arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2.

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%I A221322 #7 Jun 02 2025 08:15:57
%S A221322 1,17,2008,2460824,26135748494,2568131772343102,
%T A221322 2242286238164144345340,17596650117587793920907469032
%N A221322 Number of n X n arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2.
%C A221322 Diagonal of A221328
%e A221322 Some solutions for n=3
%e A221322 ..1..1..2....2..0..1....0..2..0....1..0..2....0..2..1....1..0..1....2..1..0
%e A221322 ..0..0..1....1..2..1....1..2..1....1..1..0....2..0..0....1..2..1....2..1..1
%e A221322 ..1..1..2....0..2..0....0..1..2....2..1..1....1..2..1....1..2..0....1..1..0
%K A221322 nonn
%O A221322 1,2
%A A221322 _R. H. Hardin_ Jan 11 2013

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