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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 63 |
| 3 | 3367 |
| 4 | 167835 |
| 5 | 7803391 |
| 6 | 339133803 |
| 7 | 13887495007 |
| 8 | 541044196875 |
| 9 | 20237096702431 |
| 10 | 732455240043243 |
| 11 | 25820836854042847 |
| 12 | 891331324715015115 |
| 13 | 30260208833985800671 |
| 14 | 1013882831306569043883 |
| 15 | 33620617443978687281887 |
| 16 | 1105857774681062127612555 |
[0,1,63,3367,167835,7803391,339133803,13887495007, 541044196875,20237096702431,732455240043243, 25820836854042847,891331324715015115, 30260208833985800671,1013882831306569043883, 33620617443978687281887,1105857774681062127612555] |