A222856 Number of nX2 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

3, 6, 18, 41, 123, 310, 957, 2530, 7848, 21618, 67131, 188835, 585276, 1670602, 5161503, 14880389, 45808419, 133004125, 408229851, 1191329175, 3646802121, 10684589006, 32632896159, 95903053435, 292350907470, 861289976308

Offset

1,1

Comments

Column 2 of A222862

Links

R. H. Hardin, Table of n, a(n) for n = 1..63

Example

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

Crossrefs

Sequence in context: A216813 A356766 A181037 * A342583 A007990 A197050

Adjacent sequences: A222853 A222854 A222855 * A222857 A222858 A222859

Keyword

nonn

Author

R. H. Hardin Mar 07 2013

Status

approved