Number of (n+2)X1 0..3 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.
A223492
Number of (n+2)X1 0..3 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) =28a(1) =106a(2) =466a(3) =1970a(4) =7904a(5) =31897a(6) =130224a(7) =508551a(8) =2071740a(9) =8361761a(10) =33294270a(11) =132488646a(12) =535901943a(13) =2137571624a(14) =8555879403a(15) =34280993597a(16) =137026129884a(17) =548302259588
External references
- oeis: A223492