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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 10 |
| 4 | 74 |
| 5 | 718 |
| 6 | 7477 |
| 7 | 219131 |
| 8 | 13595141 |
| 9 | 1430955986 |
| 10 | 323294486785 |
[1,5,10,74,718,7477,219131,13595141,1430955986, 323294486785] |