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A215921 Number of diagonal and antidiagonal neighbor colorings of the odd squares of an n X 3 array with new integer colors introduced in row major order. 1
1, 2, 4, 42, 136, 2906, 12840, 433252, 2387180, 113503692, 742181112, 46538017584, 350038464728, 27700815674032, 234578644301776, 22702140562948192, 213078984368820288, 24626774613248937584, 253140626416265149920 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 3 of A215924.
LINKS
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..2....1..x..1....1..x..2....1..x..1....1..x..2....1..x..2....1..x..1
..x..3..x....x..2..x....x..0..x....x..2..x....x..0..x....x..3..x....x..2..x
..1..x..1....3..x..1....3..x..4....1..x..1....2..x..2....4..x..5....0..x..1
CROSSREFS
Cf. A215924.
Sequence in context: A103105 A018312 A009547 * A009811 A364237 A009591
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 27 2012
STATUS
approved

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Last modified May 27 14:41 EDT 2024. Contains 372861 sequences. (Running on oeis4.)