Number of 4Xn 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.
A223654
Number of 4Xn 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) =5a(1) =25a(2) =43a(3) =229a(4) =799a(5) =3237a(6) =16975a(7) =58813a(8) =262975a(9) =1273157a(10) =6142655a(11) =26877117a(12) =132748947a(13) =716258257a(14) =3072240791a(15) =15826485913a(16) =73962438259a(17) =366204124645
External references
- oeis: A223654