Number of n X 1 0..2 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative.
A223188
Number of n X 1 0..2 arrays with all rows and columns having a nonnegative 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) =16a(3) =50a(4) =138a(5) =387a(6) =1143a(7) =3402a(8) =9948a(9) =30747a(10) =90018a(11) =266959a(12) =805676a(13) =2433677a(14) =7192342a(15) =21660095a(16) =64921118a(17) =194318785a(18) =583516248a(19) =1749692999a(20) =5235795129a(21) =15779920510a(22) =47191559739a(23) =141322913448a(24) =424521847845
External references
- oeis: A223188