A222971 Number of 3 X (n+1) 0..1 arrays with every row least squares fitting to a positive-slope straight line and every column least squares fitting to a zero- or positive-slope straight line, with a single point array taken as having zero slope.

1, 6, 96, 576, 5180, 28836, 222887, 1241310, 8712264, 48837168, 328280478, 1854039060, 12126536066, 69047705664, 443482507552, 2544063717888, 16136462307440, 93109093464048, 585311170019020, 3393940344415872

Offset

1,2

Links

R. H. Hardin, Table of n, a(n) for n = 1..24

Example

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

Crossrefs

Row 3 of A222969.

Sequence in context: A116289 A116256 A275086 * A196813 A179058 A303212

Adjacent sequences: A222968 A222969 A222970 * A222972 A222973 A222974

Keyword

nonn

Author

R. H. Hardin, Mar 10 2013

Status

approved