Number of nX7 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.
A223226
Number of nX7 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) =68a(1) =4624a(2) =21300a(3) =2272864a(4) =67584976a(5) =3725574696a(6) =180758152704
External references
- oeis: A223226