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| n | a(n) |
|---|---|
| 1 | 60 |
| 2 | 1740 |
| 3 | 40908 |
| 4 | 872460 |
| 5 | 17593092 |
| 6 | 342055548 |
| 7 | 6482020140 |
| 8 | 120520189980 |
| 9 | 2208175854948 |
| 10 | 39988864047276 |
| 11 | 717328864510092 |
| 12 | 12766536225007020 |
| 13 | 225704408971133124 |
| 14 | 3967699804321484124 |
| 15 | 69407066832964073964 |
[60,1740,40908,872460,17593092,342055548, 6482020140,120520189980,2208175854948, 39988864047276,717328864510092,12766536225007020, 225704408971133124,3967699804321484124, 69407066832964073964] |