Number of nX4 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.
A223191
Number of nX4 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) =50a(1) =2500a(2) =20016a(3) =1133664a(4) =41164952a(5) =1615611339a(6) =76015542500
External references
- oeis: A223191