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A207867 Number of nX5 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
15, 10900, 68162042, 1625686993918, 103204230192540988 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A207868

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A140285 A208401 A198911 * A206513 A271404 A271405

Adjacent sequences:  A207864 A207865 A207866 * A207868 A207869 A207870

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 21 2012

STATUS

approved

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Last modified May 16 14:13 EDT 2021. Contains 343949 sequences. (Running on oeis4.)