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A207998 Number of nX2 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
2, 15, 114, 1657, 36401, 1094076, 42436913, 2042803419, 118645071202, 8138047375093, 648222594284197, 59148486677131940, 6113429673418115581, 708972517372901061559, 91508202542991877872978, 13053785934982985242672065 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..100

EXAMPLE

Some solutions for n=4

..0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0

..0..0....1..1....0..1....0..1....1..0....0..0....1..1....0..0....0..0....0..0

..1..1....1..1....1..1....1..1....1..1....1..1....1..1....1..1....1..2....1..1

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

CROSSREFS

Column 2 of A208001.

Sequence in context: A052874 A074622 A031507 * A246570 A052861 A300910

Adjacent sequences:  A207995 A207996 A207997 * A207999 A208000 A208001

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 22 2012

EXTENSIONS

Terms a(16) 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.)