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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 107 |
| 3 | 2460 |
| 4 | 56922 |
| 5 | 1317211 |
| 6 | 30481165 |
| 7 | 705355254 |
| 8 | 16322409116 |
[1,5,107,2460,56922,1317211,30481165,705355254, 16322409116] |