A217341 Number of nX3 arrays of occupancy after each element moves to some horizontal or vertical neighbor but without 2-loops

0, 7, 144, 2389, 37114, 561573, 8399702, 124988061, 1855434240, 27513859347, 407794083248, 6042695120617, 89531233299098, 1326469665327327, 19652162517014150, 291151404103798147, 4313455938625144092

Offset

1,2

Comments

Column 3 of A217346

Links

R. H. Hardin, Table of n, a(n) for n = 1..53

Formula

Empirical: a(n) = 23*a(n-1) -125*a(n-2) +13*a(n-3) +648*a(n-4) -208*a(n-5) -1279*a(n-6) +327*a(n-7) +1739*a(n-8) -1293*a(n-9) +138*a(n-10) +130*a(n-11) +8*a(n-12)

Example

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

Crossrefs

Sequence in context: A286398 A104240 A263599 * A156978 A163028 A367527

Adjacent sequences: A217338 A217339 A217340 * A217342 A217343 A217344

Keyword

nonn

Author

R. H. Hardin Oct 01 2012

Status

approved