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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 42 |
| 2 | 1722 |
| 3 | 70602 |
| 4 | 2894682 |
| 5 | 118681962 |
| 6 | 4865960442 |
| 7 | 199504377261 |
| 8 | 8179679432400 |
| 9 | 335366855281920 |
| 10 | 13750041007253040 |
| 11 | 563751678865841760 |
| 12 | 23113818733806664080 |
| 13 | 947666563998666456000 |
| 14 | 38854328956361647813980 |
[1,42,1722,70602,2894682,118681962,4865960442, 199504377261,8179679432400,335366855281920, 13750041007253040,563751678865841760, 23113818733806664080,947666563998666456000, 38854328956361647813980] |