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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 70 |
| 4 | 1775 |
| 5 | 66175 |
| 6 | 3283475 |
| 7 | 204594175 |
| 8 | 15411893450 |
| 9 | 1366394303500 |
| 10 | 139767921720875 |
| 11 | 16243630181913625 |
| 12 | 2118892887756520250 |
| 13 | 307173379745256857875 |
| 14 | 49084564051462443496250 |
| 15 | 8586127214178418541668750 |
| 16 | 1634509914502001105016284375 |
| 17 | 336910750825106071274158853125 |
| 18 | 74862327518834451026921878887500 |
| 19 | 17862833297180486514281227128971875 |
| 20 | 4561279298680105599840369905594562500 |
[1,5,70,1775,66175,3283475,204594175,15411893450, 1366394303500,139767921720875,16243630181913625, 2118892887756520250,307173379745256857875, 49084564051462443496250,8586127214178418541668750, 1634509914502001105016284375, 336910750825106071274158853125, 74862327518834451026921878887500, 17862833297180486514281227128971875, 4561279298680105599840369905594562500] |