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| n | a(n) |
|---|---|
| 1 | 60 |
| 2 | 264 |
| 3 | 2520 |
| 4 | 26152 |
| 5 | 274132 |
| 6 | 3022220 |
| 7 | 33638540 |
| 8 | 379997096 |
| 9 | 4324466328 |
| 10 | 49387377504 |
| 11 | 566509205348 |
| 12 | 6521404038024 |
| 13 | 75307822934828 |
| 14 | 872056487276532 |
| 15 | 10122186382107364 |
| 16 | 117736171713864168 |
| 17 | 1371964294216603880 |
[60,264,2520,26152,274132,3022220,33638540, 379997096,4324466328,49387377504,566509205348, 6521404038024,75307822934828,872056487276532, 10122186382107364,117736171713864168, 1371964294216603880] |