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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 15 |
| 3 | 203 |
| 4 | 4140 |
| 5 | 115975 |
| 6 | 4213597 |
| 7 | 190899322 |
| 8 | 10480142147 |
| 9 | 682076806159 |
| 10 | 51724158235372 |
| 11 | 4506715738447323 |
| 12 | 445958869294805289 |
| 13 | 49631246523618756274 |
| 14 | 6160539404599934652455 |
| 15 | 846749014511809332450147 |
| 16 | 128064670049908713818925644 |
[1,2,15,203,4140,115975,4213597,190899322, 10480142147,682076806159,51724158235372, 4506715738447323,445958869294805289, 49631246523618756274,6160539404599934652455, 846749014511809332450147, 128064670049908713818925644] |