Number of nX6 0..1 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.
A223225
Number of nX6 0..1 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) =37a(1) =1369a(2) =4656a(3) =251110a(4) =4466304a(5) =137420222a(6) =3725574696a(7) =113910021538
External references
- oeis: A223225