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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 27 |
| 4 | 255 |
| 5 | 3028 |
| 6 | 41972 |
| 7 | 647034 |
| 8 | 10760307 |
| 9 | 189317370 |
| 10 | 3478597980 |
[1,1,4,27,255,3028,41972,647034,10760307, 189317370,3478597980] |