A221767 Number of nX6 arrays of occupancy after each element moves to some horizontal or vertical neighbor, without 2-loops or left turns

0, 55, 3125, 141177, 7115200, 347487163, 16949434757, 827634377153, 40390407683703, 1971106075073481, 96192307643812016, 4694244462294115117, 229081654358812855517, 11179298440465068878911

Offset

1,2

Comments

Column 6 of A221768

Links

Table of n, a(n) for n=1..14.

Example

Some solutions for n=3
..1..1..0..1..1..0....1..1..1..0..1..1....0..1..1..1..0..1....1..1..1..1..1..1
..2..2..1..1..1..1....2..0..1..1..2..1....1..1..1..1..1..2....1..0..2..1..2..2
..1..1..1..1..1..1....1..1..2..1..1..0....1..1..2..1..1..1....1..0..1..0..1..1

Crossrefs

Sequence in context: A231640 A076657 A212736 * A095659 A081993 A060077

Adjacent sequences: A221764 A221765 A221766 * A221768 A221769 A221770

Keyword

nonn

Author

R. H. Hardin Jan 25 2013

Status

approved