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| n | a(n) |
|---|---|
| 1 | 419 |
| 2 | 1475 |
| 3 | 6110 |
| 4 | 25413 |
| 5 | 106848 |
| 6 | 454332 |
| 7 | 1933924 |
| 8 | 8248373 |
| 9 | 35227773 |
| 10 | 150417081 |
| 11 | 642360601 |
| 12 | 2744199183 |
| 13 | 11723677708 |
| 14 | 50083292461 |
| 15 | 213960360261 |
| 16 | 914078793470 |
| 17 | 3905115873457 |
| 18 | 16683360703840 |
| 19 | 71274426314113 |
| 20 | 304497975802593 |
[419,1475,6110,25413,106848,454332,1933924, 8248373,35227773,150417081,642360601,2744199183, 11723677708,50083292461,213960360261,914078793470, 3905115873457,16683360703840,71274426314113, 304497975802593] |