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%I #7 May 28 2021 13:00:49
%S 0,4,270,279841,2714713664,310569670802169,376959882525471479946,
%T 5114167130942310710200312969
%N Number of n X n arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor.
%C Diagonal of A221087.
%e Some solutions for n=3
%e ..0..1..2....0..3..1....0..2..0....0..1..1....1..2..0....0..2..1....0..1..1
%e ..0..3..0....0..0..0....1..2..0....1..3..0....1..3..1....1..2..1....0..3..1
%e ..1..2..0....1..3..1....2..2..0....1..2..0....0..1..0....0..2..0....1..2..0
%Y Cf. A221087.
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 01 2013