Number of nX3 0..3 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.
A223405
Number of nX3 0..3 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) =36a(1) =1296a(2) =11254a(3) =449810a(4) =13266784a(5) =417523315a(6) =14781272688a(7) =521262156765
External references
- oeis: A223405