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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 37 |
| 2 | 915 |
| 3 | 19470 |
| 4 | 390093 |
| 5 | 7676097 |
| 6 | 151706126 |
| 7 | 3049865390 |
| 8 | 62838757553 |
| 9 | 1332854461081 |
| 10 | 29179950599865 |
| 11 | 660339422279706 |
| 12 | 15457495745411446 |
| 13 | 374364455260685536 |
| 14 | 9379635007416160256 |
| 15 | 243036207870660550192 |
[1,37,915,19470,390093,7676097,151706126, 3049865390,62838757553,1332854461081, 29179950599865,660339422279706,15457495745411446, 374364455260685536,9379635007416160256, 243036207870660550192] |