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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 11 |
| 6 | 126 |
| 7 | 2383 |
| 8 | 65847 |
| 9 | 2484405 |
| 10 | 122300214 |
| 11 | 7600462726 |
| 12 | 581393350442 |
| 13 | 53649579705613 |
| 14 | 5874521948167920 |
| 15 | 752862908769402263 |
| 16 | 111616832101497426539 |
| 17 | 18952126477270139013143 |
| 18 | 3653537196995939362232795 |
| 19 | 793546121525181745226364532 |
[1,1,1,2,11,126,2383,65847,2484405,122300214, 7600462726,581393350442,53649579705613, 5874521948167920,752862908769402263, 111616832101497426539,18952126477270139013143, 3653537196995939362232795, 793546121525181745226364532] |