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A207979 Number of nX3 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any diagonal or antidiagonal neighbor (colorings ignoring permutations of colors) 1
5, 67, 4192, 587208, 147512732, 58668937932, 34119101220224, 27451586022436696, 29334574202437277520, 40343697156563884675488, 69646199705725564208484736, 147875840329637502384856552096, 379682313150983568999164195148800 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A207981

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..16

EXAMPLE

Some solutions for n=4

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

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

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

..1..1..0....1..0..1....0..2..0....3..1..4....1..1..0....2..1..1....0..4..0

CROSSREFS

Sequence in context: A291807 A197776 A197606 * A129963 A115764 A252794

Adjacent sequences:  A207976 A207977 A207978 * A207980 A207981 A207982

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 22 2012

STATUS

approved

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Last modified September 23 04:54 EDT 2020. Contains 337295 sequences. (Running on oeis4.)