Number of 4 X n 0..2 arrays with all rows having a nonnegative second derivative, and all 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.
A223393
Number of 4 X n 0..2 arrays with all rows having a nonnegative second derivative, and all 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) =31a(1) =961a(2) =5450a(3) =188958a(4) =4182458a(5) =101698908a(6) =2972878486a(7) =84155649292
External references
- oeis: A223393