Number of 3Xn 0..3 arrays with all rows having a nonnegative second derivative, and all and 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.
A223496
Number of 3Xn 0..3 arrays with all rows having a nonnegative second derivative, and all and 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) =28a(1) =784a(2) =5264a(3) =164650a(4) =3726450a(5) =89957891a(6) =2474370640a(7) =67279126908
External references
- oeis: A223496