A232146 Number of nX3 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally, diagonally or antidiagonally

7, 191, 3669, 67311, 1270511, 23931701, 450210003, 8472530835, 159447698709, 3000626337403, 56468631745403, 1062681339900597, 19998556467233307, 376352018854011055, 7082553491165677717, 133286288174839937051

Offset

1,1

Comments

Column 3 of A232149

Links

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

Formula

Empirical: a(n) = 12*a(n-1) +85*a(n-2) +715*a(n-3) +1790*a(n-4) +2337*a(n-5) -7031*a(n-6) -36834*a(n-7) -50760*a(n-8) -20925*a(n-9)

Example

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

Crossrefs

Sequence in context: A368592 A198258 A200819 * A264353 A024096 A030257

Adjacent sequences: A232143 A232144 A232145 * A232147 A232148 A232149

Keyword

nonn

Author

R. H. Hardin, Nov 19 2013

Status

approved