Number of (n+2)X3 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.
A223647
Number of (n+2)X3 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) =43a(2) =343a(3) =1973a(4) =10425a(5) =64669a(6) =347013a(7) =1639675a(8) =8731185a(9) =47326725a(10) =233731602a(11) =1110256634a(12) =5956720086a(13) =29392316077a(14) =153244540299a(15) =763311486416
External references
- oeis: A223647