Number of nX6 0..2 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative.
A223193
Number of nX6 0..2 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative.
Terms
- a(0) =387a(1) =149769a(2) =3407893a(3) =1615611339a(4) =386807892609
External references
- oeis: A223193