A222780 Number of (n+3) X 4 0..1 arrays with every row and column least squares fitting to a positive slope straight line.

6, 36, 696, 3960, 44092, 245952, 2148348, 11909916, 92914316, 516123540, 3754783282, 20944422720, 145858066580, 819115053456, 5532833258412, 31237280045460, 206640812099598, 1173206191661712

Offset

1,1

Links

Table of n, a(n) for n=1..18.

Example

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

Crossrefs

Column 1 of A222784.

Sequence in context: A392720 A296389 A077290 * A206636 A244841 A268161

Adjacent sequences: A222777 A222778 A222779 * A222781 A222782 A222783

Keyword

nonn,more

Author

R. H. Hardin, Mar 05 2013

Status

approved