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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 4998 |
| 3 | 636912 |
| 4 | 93584344 |
| 5 | 13204707603 |
| 6 | 1887519232797 |
| 7 | 268596415269518 |
| 8 | 38282460992672716 |
| 9 | 5453232104885876045 |
| 10 | 776953643188694040712 |
| 11 | 110689277453680961314489 |
| 12 | 15769820956322189825472915 |
[21,4998,636912,93584344,13204707603, 1887519232797,268596415269518,38282460992672716, 5453232104885876045,776953643188694040712, 110689277453680961314489, 15769820956322189825472915] |