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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 3 |
| 2 | 58 |
| 3 | 1045 |
| 4 | 18756 |
| 5 | 336567 |
| 6 | 6039454 |
| 7 | 108373609 |
| 8 | 1944685512 |
| 9 | 34895965611 |
| 10 | 626182695490 |
| 11 | 11236392553213 |
| 12 | 201628883262348 |
| 13 | 3618083506169055 |
| 14 | 64923874227780646 |
| 15 | 1165011652593882577 |
| 16 | 20905285872462105744 |
[0,3,58,1045,18756,336567,6039454,108373609, 1944685512,34895965611,626182695490, 11236392553213,201628883262348,3618083506169055, 64923874227780646,1165011652593882577, 20905285872462105744] |