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| n | a(n) |
|---|---|
| 1 | 42 |
| 2 | 1764 |
| 3 | 7086 |
| 4 | 31419 |
| 5 | 169974 |
| 6 | 992574 |
| 7 | 6206445 |
| 8 | 40122936 |
| 9 | 265568130 |
| 10 | 1780946115 |
| 11 | 12045557394 |
| 12 | 81883111842 |
| 13 | 558396389421 |
| 14 | 3815311552572 |
| 15 | 26099962612902 |
| 16 | 178677791790795 |
| 17 | 1223770846004094 |
| 18 | 8384018150245206 |
| 19 | 57448693695345549 |
[42,1764,7086,31419,169974,992574,6206445, 40122936,265568130,1780946115,12045557394, 81883111842,558396389421,3815311552572, 26099962612902,178677791790795,1223770846004094, 8384018150245206,57448693695345549] |