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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 15 |
| 3 | 204 |
| 4 | 3905 |
| 5 | 96030 |
| 6 | 2883167 |
| 7 | 102213944 |
| 8 | 4178507265 |
| 9 | 193501094490 |
| 10 | 10011386405999 |
| 11 | 572335117886532 |
| 12 | 35827847605137601 |
| 13 | 2437406399741075126 |
| 14 | 179059769134174484415 |
| 15 | 14127079203550978667760 |
| 16 | 1191321539697176278429697 |
| 17 | 106935795565608726499866930 |
[1,2,15,204,3905,96030,2883167,102213944, 4178507265,193501094490,10011386405999, 572335117886532,35827847605137601, 2437406399741075126,179059769134174484415, 14127079203550978667760,1191321539697176278429697, 106935795565608726499866930] |