T(n,k)=Number of (n+2)Xk 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.
A223495
T(n,k)=Number of (n+2)Xk 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) =106a(3) =5264a(4) =11236a(5) =466a(6) =164650a(7) =172262a(8) =217156a(9) =1970a(10) =3726450a(11) =20316988a(12) =7974566a(13) =3880900a(14) =7904a(15) =89957891a(16) =1634694162a(17) =4307975642a(18) =332428881a(19) =62473216a(20) =31897a(21) =2474370640a(22) =141426507841a(24) =802504089833a(25) =12184078320
External references
- oeis: A223495