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

Author

R. H. Hardin, Mar 10 2013

Keywords

• nonn

Examples

			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
		

Links

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

Crossrefs

Row 3 of A222969.