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)

2, 30, 1573, 192328, 43366459, 15769674462, 8494585220016, 6391850672195207, 6435536606760976374, 8388789053759733374255, 13792349692923790472807338, 28002764873470436036725295426, 68986219453948522377865096287773

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: A364504 A262004 A132104 * A144501 A198861 A162841

Adjacent sequences: A208090 A208091 A208092 * A208094 A208095 A208096

Keyword

nonn

Author

R. H. Hardin Feb 23 2012

Status

approved