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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
0
4, 106, 10896, 26220153, 263793650432
OFFSET
1,1
COMMENTS
Diagonal of A222931
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 09 2013
STATUS
approved