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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 13 |
| 3 | 263 |
| 4 | 7518 |
| 5 | 280074 |
| 6 | 12895572 |
| 7 | 707902740 |
| 8 | 45152821872 |
| 9 | 3282497058384 |
| 10 | 267944580145440 |
| 11 | 24268165166553120 |
| 12 | 2415271958048304000 |
| 13 | 262018936450492859520 |
| 14 | 30774091302535254992640 |
| 15 | 3890462788950375951532800 |
| 16 | 526745212429645673433446400 |
| 17 | 76046696235437224473872640000 |
[1,13,263,7518,280074,12895572,707902740, 45152821872,3282497058384,267944580145440, 24268165166553120,2415271958048304000, 262018936450492859520,30774091302535254992640, 3890462788950375951532800, 526745212429645673433446400, 76046696235437224473872640000] |