Number of 6Xn 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.
A223656
Number of 6Xn 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) =27a(1) =729a(2) =1973a(3) =78213a(4) =1044311a(5) =22982345a(6) =502081983a(7) =9622736121a(8) =218268103915
External references
- oeis: A223656