A222995 Number of nX4 0..2 arrays with successive rows and columns fitting to straight lines with nondecreasing slope, with a single point array taken as having zero slope

81, 867, 35845, 703848, 19187708, 342820859, 6895486778, 107560020020, 1764791619523

Offset

1,1

Comments

Column 4 of A222996

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for n=3
..1..1..2..0....2..0..0..1....1..2..2..2....1..1..0..0....2..2..2..0
..2..2..0..2....0..1..2..2....1..0..1..2....0..1..1..1....0..1..2..1
..0..1..2..0....0..0..1..2....0..1..1..2....0..2..1..2....0..0..1..2

Crossrefs

Sequence in context: A045792 A067478 A076749 * A173810 A205047 A086580

Adjacent sequences: A222992 A222993 A222994 * A222996 A222997 A222998

Keyword

nonn

Author

R. H. Hardin Mar 11 2013

Status

approved