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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 114 |
| 3 | 3612 |
| 4 | 80180 |
| 5 | 1374690 |
| 6 | 19234194 |
| 7 | 227605448 |
| 8 | 2335932504 |
| 9 | 21186110970 |
| 10 | 172295622730 |
| 11 | 1271112537684 |
| 12 | 8588601364668 |
| 13 | 53573492643034 |
| 14 | 310601807143530 |
| 15 | 1683493452034320 |
| 16 | 8573748834211984 |
| 17 | 41210997268585158 |
| 18 | 187693442844729174 |
| 19 | 812839595630249540 |
[2,114,3612,80180,1374690,19234194,227605448, 2335932504,21186110970,172295622730,1271112537684, 8588601364668,53573492643034,310601807143530, 1683493452034320,8573748834211984, 41210997268585158,187693442844729174, 812839595630249540] |