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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 17 |
| 4 | 182 |
| 5 | 3750 |
| 6 | 152096 |
| 7 | 12228012 |
| 8 | 1951037956 |
| 9 | 617193546408 |
| 10 | 386470351678894 |
[1,3,17,182,3750,152096,12228012,1951037956, 617193546408,386470351678894] |