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| n | a(n) |
|---|---|
| 1 | 60 |
| 2 | 360 |
| 3 | 3078 |
| 4 | 24192 |
| 5 | 183072 |
| 6 | 1350672 |
| 7 | 9779808 |
| 8 | 69793968 |
| 9 | 492374976 |
| 10 | 3441051984 |
| 11 | 23861339424 |
| 12 | 164375084016 |
| 13 | 1125975740544 |
| 14 | 7675458754704 |
| 15 | 52099028628960 |
| 16 | 352309891913520 |
| 17 | 2374503933353280 |
| 18 | 15956129491021776 |
| 19 | 106934858162261664 |
[60,360,3078,24192,183072,1350672,9779808, 69793968,492374976,3441051984,23861339424, 164375084016,1125975740544,7675458754704, 52099028628960,352309891913520,2374503933353280, 15956129491021776,106934858162261664] |