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A207866 Number of nX4 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) 0
5, 500, 278982, 455546040, 1625686993918, 10764437129618296, 119010390034543491042, 2040368351234509987725212, 51350903376256822436382238230, 1818472780230512625778385363238944 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A207868

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A124358 A198719 A198910 * A013305 A114066 A014287

Adjacent sequences:  A207863 A207864 A207865 * A207867 A207868 A207869

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 21 2012

STATUS

approved

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Last modified June 18 20:04 EDT 2021. Contains 345121 sequences. (Running on oeis4.)