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%I #5 May 28 2021 13:45:57
%S 0,38,6893,938070,103485930,11446121074,1234879060395,133129213688286
%N Number of 4 X n arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without 2-loops.
%C Row 4 of A221351.
%e Some solutions for n=3
%e ..0..1..0....0..3..0....1..2..0....0..0..0....0..3..1....1..1..0....1..2..1
%e ..1..2..1....0..0..1....1..2..0....2..4..0....0..2..1....1..1..0....0..4..1
%e ..1..2..0....0..4..2....1..1..0....1..1..0....0..2..1....1..4..1....0..2..0
%e ..1..3..0....1..1..0....1..3..0....1..3..0....1..1..0....0..2..0....0..0..1
%Y Cf. A221351.
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 11 2013
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