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A207865 Number of nX3 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal or vertical neighbor (colorings ignoring permutations of colors) 1
2, 34, 2052, 278982, 68162042, 26419793726, 15002771641712, 11807624578397830, 12361734324171045410, 16679505289611340233906, 28284296659644702241447604, 59055088260515144420128767278, 149249218670114328150978145481610 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A207868

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..20

EXAMPLE

Some solutions for n=5

..0..1..2....0..1..0....0..1..0....0..1..0....0..1..0....0..1..0....0..1..0

..2..0..1....1..0..1....1..0..1....1..0..1....1..0..2....1..0..1....1..2..1

..0..1..0....0..1..0....0..1..0....0..1..0....0..1..3....0..1..0....2..0..2

..1..0..1....1..0..1....1..0..1....1..2..1....1..0..1....2..0..1....0..1..0

..0..1..0....0..2..0....2..1..0....0..1..0....0..1..2....0..1..0....1..0..1

CROSSREFS

Sequence in context: A198977 A198718 A198909 * A216082 A165938 A255434

Adjacent sequences:  A207862 A207863 A207864 * A207866 A207867 A207868

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 21 2012

STATUS

approved

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Last modified November 28 20:58 EST 2021. Contains 349415 sequences. (Running on oeis4.)