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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 36 |
| 5 | 182 |
| 6 | 1096 |
| 7 | 7678 |
| 8 | 61430 |
| 9 | 552871 |
| 10 | 5528710 |
| 11 | 60815817 |
| 12 | 729789815 |
| 13 | 9487267606 |
| 14 | 132821746496 |
| 15 | 1992326197440 |
| 16 | 31877219159043 |
| 17 | 541912725703747 |
| 18 | 9754429062667447 |
| 19 | 185334152190681505 |
| 20 | 3706683043813630117 |
| 21 | 77840343920086232475 |
| 22 | 1712487566241897114452 |
[1,1,3,9,36,182,1096,7678,61430,552871,5528710, 60815817,729789815,9487267606,132821746496, 1992326197440,31877219159043,541912725703747, 9754429062667447,185334152190681505, 3706683043813630117,77840343920086232475, 1712487566241897114452] |