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| n | a(n) |
|---|---|
| 1 | 1220 |
| 2 | 8324 |
| 3 | 56212 |
| 4 | 411848 |
| 5 | 3007000 |
| 6 | 22597004 |
| 7 | 168812492 |
| 8 | 1277805668 |
| 9 | 9619090052 |
| 10 | 72923111912 |
| 11 | 550545635664 |
| 12 | 4173813523988 |
| 13 | 31551152184268 |
| 14 | 239127142655612 |
| 15 | 1808804180109732 |
| 16 | 13705085820170408 |
| 17 | 103705720260565068 |
[1220,8324,56212,411848,3007000,22597004, 168812492,1277805668,9619090052,72923111912, 550545635664,4173813523988,31551152184268, 239127142655612,1808804180109732, 13705085820170408,103705720260565068] |