A216079 Number of horizontal and antidiagonal neighbor colorings of the odd squares of an n X 3 array with new integer colors introduced in row major order.

1, 2, 5, 52, 203, 4140, 21147, 678570, 4213597, 190899322, 1382958545, 82864869804, 682076806159, 51724158235372, 474869816156751, 44152005855084346, 445958869294805289, 49631246523618756274, 545717047936059989389

Offset

1,2

Comments

Column 3 of A216084.

Appears to be identical to A000110 except for elements in the latter indexed by 3x + 2 for x >= 0. - Chris Boyd, Dec 20 2015

Links

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

Example

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

Crossrefs

Sequence in context: A208206 A376043 A005114 * A206584 A268286 A081090

Adjacent sequences: A216076 A216077 A216078 * A216080 A216081 A216082

Keyword

nonn

Author

R. H. Hardin, Sep 01 2012

Status

approved