A216333 Number of horizontal and antidiagonal neighbor colorings of the even squares of an nX3 array with new integer colors introduced in row major order

1, 2, 15, 52, 877, 4140, 115975, 678570, 27644437, 190899322, 10480142147, 82864869804, 5832742205057, 51724158235372, 4506715738447323, 44152005855084346, 4638590332229999353, 49631246523618756274

Offset

1,2

Comments

Column 3 of A216338

Links

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

Example

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

Crossrefs

Sequence in context: A344819 A015520 A098520 * A056078 A142861 A305673

Adjacent sequences: A216330 A216331 A216332 * A216334 A216335 A216336

Keyword

nonn

Author

R. H. Hardin Sep 04 2012

Status

approved