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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 17 |
| 4 | 274 |
| 5 | 6749 |
| 6 | 231276 |
| 7 | 10465440 |
| 8 | 604220826 |
| 9 | 43388420549 |
| 10 | 3797054582794 |
| 11 | 398157728106929 |
| 12 | 49311011342018168 |
| 13 | 7124133759620985652 |
| 14 | 1187818792835133749984 |
| 15 | 226420783437860189825400 |
| 16 | 48936975180367428260159850 |
| 17 | 11904986360488865549641429797 |
| 18 | 3238569202146221391019821488694 |
[1,1,2,17,274,6749,231276,10465440,604220826, 43388420549,3797054582794,398157728106929, 49311011342018168,7124133759620985652, 1187818792835133749984,226420783437860189825400, 48936975180367428260159850, 11904986360488865549641429797, 3238569202146221391019821488694] |