A216613 Number of horizontal, diagonal and antidiagonal neighbor colorings of the odd squares of a 3 X n array with new integer colors introduced in row major order.

1, 2, 2, 15, 41, 716, 2847, 83440, 426422, 18171918, 112072316, 6423127757, 46054057965, 3376465219485, 27457462735926, 2486327138729353, 22530435476364494, 2454996141671330713, 24463971326544703312

Offset

1,2

Comments

Row 3 of A216612.

Links

R. H. Hardin, Table of n, a(n) for n = 1..41

Example

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

Crossrefs

Cf. A216612.

Sequence in context: A185244 A329920 A006929 * A215900 A264838 A184718

Adjacent sequences: A216610 A216611 A216612 * A216614 A216615 A216616

Keyword

nonn

Author

R. H. Hardin, Sep 10 2012

Status

approved