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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 7 |
| 5 | 31 |
| 6 | 51 |
| 7 | 771 |
| 8 | 1401 |
| 9 | 14841 |
| 10 | 51129 |
| 11 | 3679929 |
| 12 | 3957129 |
| 13 | 482958729 |
| 14 | 927745929 |
| 15 | 6739632009 |
| 16 | 27172044009 |
| 17 | 20949961932009 |
| 18 | 22047762636009 |
| 19 | 6424421468364009 |
| 20 | 6728534219386089 |
| 21 | 122581010799226089 |
| 22 | 2444896564058746089 |
| 23 | 1126445624341666426089 |
[1,2,4,7,31,51,771,1401,14841,51129,3679929, 3957129,482958729,927745929,6739632009, 27172044009,20949961932009,22047762636009, 6424421468364009,6728534219386089, 122581010799226089,2444896564058746089, 1126445624341666426089] |