T(n,k)=Number of nXk 0..1 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.
A223227
T(n,k)=Number of nXk 0..1 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) =2a(1) =4a(2) =4a(3) =5a(4) =16a(5) =5a(6) =11a(7) =25a(8) =25a(9) =11a(10) =19a(11) =121a(12) =48a(13) =121a(14) =19a(15) =37a(16) =361a(17) =280a(18) =280a(19) =361a(20) =37a(21) =68a(22) =1369a(23) =1036a(24) =3926a(25) =1036a(26) =1369a(27) =68a(28) =137a(29) =4624
External references
- oeis: A223227