Number of nX2 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.
A223189
Number of nX2 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) =9a(1) =81a(2) =256a(3) =2500a(4) =19044a(5) =149769a(6) =1306449a(7) =11573604a(8) =98962704a(9) =945378009a(10) =8103240324a(11) =71267107681a(12) =649113816976
External references
- oeis: A223189