The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 16 |
| 3 | 40 |
| 4 | 1370 |
| 5 | 10448 |
| 6 | 183088 |
| 7 | 2045378 |
| 8 | 29175688 |
| 9 | 365502344 |
| 10 | 4913369536 |
| 11 | 63632416648 |
| 12 | 840894973402 |
| 13 | 10994101352914 |
| 14 | 144572017467922 |
| 15 | 1895295043605416 |
| 16 | 24887788287735872 |
| 17 | 326523191949148616 |
[0,16,40,1370,10448,183088,2045378,29175688, 365502344,4913369536,63632416648,840894973402, 10994101352914,144572017467922,1895295043605416, 24887788287735872,326523191949148616] |