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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 51 |
| 5 | 496 |
| 6 | 6041 |
| 7 | 97155 |
| 8 | 1746481 |
| 9 | 38377034 |
| 10 | 1053921489 |
| 11 | 31722366805 |
| 12 | 1127475187757 |
| 13 | 45429396874080 |
| 14 | 1910408631449923 |
| 15 | 87682336584597009 |
| 16 | 4571067440374822934 |
| 17 | 260160909199262899454 |
| 18 | 15823372061924831882182 |
| 19 | 1034588557961336117180784 |
| 20 | 72606463908572608290939197 |
| 21 | 5235472173106695729625747152 |
| 22 | 407296805992490241506213234700 |
[1,2,8,51,496,6041,97155,1746481,38377034, 1053921489,31722366805,1127475187757, 45429396874080,1910408631449923,87682336584597009, 4571067440374822934,260160909199262899454, 15823372061924831882182,1034588557961336117180784, 72606463908572608290939197, 5235472173106695729625747152, 407296805992490241506213234700] |