A223649 Number of (n+2)X5 0..1 arrays with all rows having a nonnegative second derivative, and all and columns having a positive second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative

77, 799, 40981, 1044311, 24559913, 569451603, 13134713511, 219299436501, 4713184697381, 96531089206559, 1824338893531024, 31421788959150494

Offset

1,1

Comments

Column 5 of A223652

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Sequence in context: A059047 A046149 A222728 * A205434 A125581 A176632

Adjacent sequences: A223646 A223647 A223648 * A223650 A223651 A223652

Keyword

nonn

Author

R. H. Hardin Mar 25 2013

Status

approved