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| n | a(n) |
|---|---|
| 1 | 13 |
| 2 | 4453 |
| 3 | 9674704 |
| 4 | 75224946901 |
| 5 | 1545474559060224 |
| 6 | 69549952010359093897 |
| 7 | 6036862150681054978834432 |
| 8 | 921916957672242760231518256521 |
| 9 | 231086778644984585535258936647680000 |
[13,4453,9674704,75224946901,1545474559060224, 69549952010359093897,6036862150681054978834432, 921916957672242760231518256521, 231086778644984585535258936647680000] |