Number of (n+2)X4 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.
A223648
Number of (n+2)X4 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.
Terms
- a(0) =35a(1) =229a(2) =5751a(3) =78213a(4) =1059839a(5) =13505813a(6) =172509399a(7) =1684095249a(8) =20632590041a(9) =242227127509
External references
- oeis: A223648