A223650 Number of (n+2)X6 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

207, 3237, 427313, 22982345, 1119629805, 50246141433, 2434395476789, 75307144658325, 3271323310834015

Offset

1,1

Comments

Column 6 of A223652

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A205198 A205194 A204868 * A232346 A052093 A103477

Adjacent sequences: A223647 A223648 A223649 * A223651 A223652 A223653

Keyword

nonn

Author

R. H. Hardin Mar 25 2013

Status

approved