Number of (n+2)X1 0..2 arrays with all rows having a nonnegative second derivative, and all 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.
A223388
Number of (n+2)X1 0..2 arrays with all rows having a nonnegative second derivative, and all 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) =11a(1) =31a(2) =105a(3) =342a(4) =1044a(5) =3159a(6) =9735a(7) =28302a(8) =87129a(9) =264482a(10) =788647a(11) =2349292a(12) =7156565a(13) =21386626a(14) =64219045a(15) =193101704a(16) =578745219a(17) =1737091402a(18) =5224558074a(19) =15601139099a(20) =46951619088a(21) =141106623033a(22) =422766761598
External references
- oeis: A223388