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A207999 Number of nX3 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any knight-move neighbor (colorings ignoring permutations of colors). 1
5, 114, 4141, 426422, 86545486, 29169661126, 14823734802701, 10648697150313375, 10321527909363771779, 13032394645031912097587, 20852865726433378283251197, 41354508341339617041441302471, 99804566252370862012176094395266, 288659258928461717629676421776606809 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..50

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Column 3 of A208001.

Sequence in context: A091026 A346273 A216342 * A223057 A208783 A089638

Adjacent sequences:  A207996 A207997 A207998 * A208000 A208001 A208002

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 22 2012

EXTENSIONS

Terms a(8) and beyond from Andrew Howroyd, Jul 01 2017

STATUS

approved

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Last modified October 23 14:42 EDT 2021. Contains 348214 sequences. (Running on oeis4.)