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A208093 Number of nX3 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal, diagonal or antidiagonal neighbor (colorings ignoring permutations of colors) 1
2, 30, 1573, 192328, 43366459, 15769674462, 8494585220016, 6391850672195207, 6435536606760976374, 8388789053759733374255, 13792349692923790472807338, 28002764873470436036725295426, 68986219453948522377865096287773 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A208096

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..16

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A089016 A262004 A132104 * A144501 A198861 A162841

Adjacent sequences:  A208090 A208091 A208092 * A208094 A208095 A208096

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 23 2012

STATUS

approved

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Last modified October 7 06:27 EDT 2022. Contains 357270 sequences. (Running on oeis4.)