Number of (n+2)X2 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.
A223646
Number of (n+2)X2 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) =9a(1) =25a(2) =169a(3) =729a(4) =3600a(5) =14161a(6) =63001a(7) =227529a(8) =1002001a(9) =4044121a(10) =16273156a(11) =62425801a(12) =265755204a(13) =1044840976a(14) =4209284641a(15) =16964020516a(16) =67776915600a(17) =271492060401
External references
- oeis: A223646