A220998 Number of nX3 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor

8, 306, 11017, 394580, 14113081, 504635391, 18042682111, 645084293748, 23063745428252, 824598809224499, 29481898439700635, 1054066854447577743, 37686070858394633616, 1347390750744270331311, 48173285030655948141067

Offset

1,1

Comments

Column 3 of A221001

Links

R. H. Hardin, Table of n, a(n) for n = 1..29

Formula

Empirical: a(n) = 45*a(n-1) -327*a(n-2) -189*a(n-3) +2183*a(n-4) -1362*a(n-5) +976*a(n-6) +10221*a(n-7) +3837*a(n-8) -432*a(n-9) -11*a(n-10)

Example

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

Crossrefs

Sequence in context: A316175 A317457 A352591 * A222091 A193812 A222095

Adjacent sequences: A220995 A220996 A220997 * A220999 A221000 A221001

Keyword

nonn

Author

R. H. Hardin Dec 28 2012

Status

approved