A232454 Number of nX3 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally, vertically, diagonally or antidiagonally

7, 381, 8227, 187989, 4423815, 103104905, 2403848151, 56071521045, 1307753203691, 30500591819149, 711367314921007, 16591243576970945, 386958078996710159, 9025036009829701405, 210491208647017904707

Offset

1,1

Comments

Column 3 of A232459

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 17*a(n-1) +110*a(n-2) +838*a(n-3) +888*a(n-4) -958*a(n-5) -4291*a(n-6) -2173*a(n-7) +1764*a(n-8) +2290*a(n-9)

Example

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

Crossrefs

Sequence in context: A201114 A027510 A354026 * A140638 A367868 A299036

Adjacent sequences: A232451 A232452 A232453 * A232455 A232456 A232457

Keyword

nonn

Author

R. H. Hardin, Nov 24 2013

Status

approved