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A221128 Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor.

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%I A221128 #5 Jul 23 2025 01:44:39
%S A221128 1,987,118472,16436223,2152770692,282454178707,36946896429843,
%T A221128 4831791752404317,631836540867287034,82621661239567004631
%N A221128 Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor.
%C A221128 Row 4 of A221125
%e A221128 Some solutions for n=3
%e A221128 ..0..1..0....1..2..1....2..1..0....1..1..0....1..2..1....0..2..1....1..2..0
%e A221128 ..2..1..0....1..1..0....0..1..1....2..1..0....0..0..1....0..3..1....1..3..1
%e A221128 ..3..1..0....2..0..0....3..2..0....3..1..1....3..1..2....0..1..1....0..0..1
%e A221128 ..2..2..0....0..4..0....1..1..0....0..0..2....0..1..0....1..1..1....0..1..2
%K A221128 nonn
%O A221128 1,2
%A A221128 _R. H. Hardin_ Jan 02 2013

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