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A222895 Number of n X n 0..2 arrays with successive rows and columns fitting to straight lines with strictly increasing slope, with a single point array taken as having zero slope 0
3, 31, 621, 230803, 129912903 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A222896

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A266487 A229258 A319896 * A105293 A104841 A092552

Adjacent sequences:  A222892 A222893 A222894 * A222896 A222897 A222898

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 08 2013

STATUS

approved

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Last modified July 2 08:50 EDT 2020. Contains 335398 sequences. (Running on oeis4.)