A221505 Number of nX3 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without consecutive moves in the same direction

0, 44, 664, 12495, 221614, 4010052, 72195950, 1301644004, 23457033692, 422775316892, 7619575554956, 137327198061432, 2475032964645724, 44607285582888084, 803952693936738644, 14489560929396894421

Offset

1,2

Comments

Column 3 of A221507

Links

R. H. Hardin, Table of n, a(n) for n = 1..20

Example

Some solutions for n=3
..0..0..0....0..3..0....0..4..0....1..1..0....0..1..1....0..1..0....0..0..0
..2..5..1....2..1..0....1..2..0....1..2..1....1..4..1....1..3..2....0..4..2
..0..1..0....1..2..0....0..0..2....0..3..0....0..1..0....0..2..0....1..2..0

Crossrefs

Sequence in context: A289647 A252869 A296649 * A160066 A358794 A120812

Adjacent sequences: A221502 A221503 A221504 * A221506 A221507 A221508

Keyword

nonn

Author

R. H. Hardin Jan 18 2013

Status

approved