Number of nX4 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.
A223223
Number of nX4 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) =11a(1) =121a(2) =280a(3) =3926a(4) =26376a(5) =251110a(6) =2272864a(7) =22449494a(8) =215688364a(9) =2635210346a(10) =26127577834a(11) =269923989830
External references
- oeis: A223223