A222857 Number of nX3 0..1 arrays with every row and column least squares fitting to a nonnegative slope straight line, with a single point array taken as having zero slope

6, 18, 108, 410, 2460, 11160, 70818, 346610, 2213136, 11587248, 73844100, 399763695, 2535415632, 14043080412, 88488807432, 497957337496, 3117629380302, 17742484266750, 110507820665700, 634061126810250, 3931544430607680

Offset

1,1

Comments

Column 3 of A222862

Links

R. H. Hardin, Table of n, a(n) for n = 1..37

Example

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

Crossrefs

Sequence in context: A052655 A274499 A181038 * A367664 A361729 A108735

Adjacent sequences: A222854 A222855 A222856 * A222858 A222859 A222860

Keyword

nonn

Author

R. H. Hardin Mar 07 2013

Status

approved