T(n,k)=Number of (n+2)Xk 0..1 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.
A223652
T(n,k)=Number of (n+2)Xk 0..1 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) =3a(1) =9a(2) =5a(3) =9a(4) =25a(5) =13a(6) =35a(7) =43a(8) =169a(9) =27a(10) =77a(11) =229a(12) =343a(13) =729a(14) =60a(15) =207a(16) =799a(17) =5751a(18) =1973a(19) =3600a(20) =119a(21) =513a(22) =3237a(23) =40981a(24) =78213a(25) =10425a(26) =14161a(27) =251a(28) =1415a(29) =16975
External references
- oeis: A223652