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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
1, 2, 5, 52, 203, 4140, 21147, 678570, 4213597, 190899322, 1382958545, 82864869804, 682076806159, 51724158235372, 474869816156751, 44152005855084346, 445958869294805289, 49631246523618756274, 545717047936059989389 (list; graph; refs; listen; history; text; internal format)
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: A004098 A208206 A005114 * A206584 A268286 A081090

Adjacent sequences:  A216076 A216077 A216078 * A216080 A216081 A216082

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 01 2012

STATUS

approved

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Last modified December 1 04:02 EST 2021. Contains 349426 sequences. (Running on oeis4.)