A222930 Number of n X n 0..3 arrays with successive rows and columns fitting to straight lines with strictly increasing slope, with a single point array taken as having zero slope

4, 106, 10896, 26220153, 263793650432

Offset

1,1

Comments

Diagonal of A222931

Links

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

Example

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

Crossrefs

Sequence in context: A087178 A104595 A356201 * A221187 A220531 A322085

Adjacent sequences: A222927 A222928 A222929 * A222931 A222932 A222933

Keyword

nonn

Author

R. H. Hardin Mar 09 2013

Status

approved