A221782 - OEIS

%I #4 Jan 25 2013 09:35:21

%S 1,184,7676,311500,12449782,496125037,19763197787,787085360643,

%T 31344203790093,1248188259617209,49704848595150246,

%U 1979319928404980888,78819337675566218873,3138697184284703490208,124987334716559797042649

%N Number of 3Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out left turns

%C Row 3 of A221780

%H R. H. Hardin, <a href="/A221782/b221782.txt">Table of n, a(n) for n = 1..46</a>

%e Some solutions for n=3

%e ..0..3..1....1..1..1....1..2..2....2..0..0....0..0..0....0..3..2....2..0..0

%e ..1..1..2....0..1..0....0..0..0....0..4..0....1..2..1....0..3..0....2..3..0

%e ..1..0..0....1..4..0....0..3..1....1..2..0....3..2..0....1..0..0....2..0..0

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 25 2013