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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 11 |
| 3 | 80 |
| 4 | 659 |
| 5 | 5865 |
| 6 | 54954 |
| 7 | 534087 |
| 8 | 5334509 |
| 9 | 54423368 |
| 10 | 564713959 |
| 11 | 5941244370 |
| 12 | 63230204938 |
| 13 | 679510980507 |
| 14 | 7363532850004 |
| 15 | 80372780735971 |
| 16 | 882818219523503 |
| 17 | 9751004973855748 |
| 18 | 108236495732967482 |
| 19 | 1206750569591821120 |
| 20 | 13507907804245679450 |
[1,2,11,80,659,5865,54954,534087,5334509,54423368, 564713959,5941244370,63230204938,679510980507, 7363532850004,80372780735971,882818219523503, 9751004973855748,108236495732967482, 1206750569591821120,13507907804245679450] |