|
%I #4 Jan 26 2013 06:59:53
%S 1,233,3426,197048,5873327,239116581,8354914378,314589265052,
%T 11412369050409,421725969587315,15441431209200525,567978925346570936,
%U 20844338781073670408,765835006795542240689,28121494605427446146221
%N Number of 4Xn arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out straight through or left turns
%C Row 4 of A221809
%H R. H. Hardin, <a href="/A221812/b221812.txt">Table of n, a(n) for n = 1..28</a>
%e Some solutions for n=3
%e ..1..0..1....0..2..2....1..1..2....2..1..1....0..3..0....0..2..0....1..2..1
%e ..1..1..1....2..0..1....1..0..1....0..0..2....0..3..0....2..0..1....1..1..0
%e ..1..2..0....0..1..0....0..1..1....1..2..0....1..1..1....2..2..1....2..1..0
%e ..1..1..2....1..1..2....1..2..1....1..2..0....1..2..0....0..1..1....0..1..2
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 26 2013
| 