Number of (n+2)X1 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.
A223645
Number of (n+2)X1 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) =5a(2) =13a(3) =27a(4) =60a(5) =119a(6) =251a(7) =477a(8) =1001a(9) =2011a(10) =4034a(11) =7901a(12) =16302a(13) =32324a(14) =64879a(15) =130246a(16) =260340a(17) =521049a(18) =1046933a(19) =2077633a(20) =4177166a(21) =8376165a(22) =16722144a(23) =33343800a(24) =67054762a(25) =133875590a(26) =267805425a(27) =536072391a(28) =1071591827a(29) =2143497919
External references
- oeis: A223645