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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 63 |
| 3 | 997 |
| 4 | 15104 |
| 5 | 214635 |
| 6 | 2886700 |
| 7 | 37224679 |
| 8 | 464804972 |
| 9 | 5658641517 |
| 10 | 67497024458 |
| 11 | 791686330307 |
| 12 | 9155901061480 |
| 13 | 104627294693465 |
| 14 | 1183339450854998 |
| 15 | 13264070830389055 |
| 16 | 147510583604457748 |
| 17 | 1629077899911720149 |
[6,63,997,15104,214635,2886700,37224679,464804972, 5658641517,67497024458,791686330307,9155901061480, 104627294693465,1183339450854998, 13264070830389055,147510583604457748, 1629077899911720149] |