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| n | a(n) |
|---|---|
| 1 | 44 |
| 2 | 336 |
| 3 | 2146 |
| 4 | 15708 |
| 5 | 118280 |
| 6 | 888420 |
| 7 | 6715618 |
| 8 | 51077518 |
| 9 | 390278378 |
| 10 | 2993722414 |
| 11 | 23038998514 |
| 12 | 177794832922 |
| 13 | 1375379617514 |
| 14 | 10662124449466 |
| 15 | 82808224932874 |
| 16 | 644200988262616 |
| 17 | 5018935818153796 |
| 18 | 39154328577073846 |
| 19 | 305823285072243150 |
[44,336,2146,15708,118280,888420,6715618,51077518, 390278378,2993722414,23038998514,177794832922, 1375379617514,10662124449466,82808224932874, 644200988262616,5018935818153796, 39154328577073846,305823285072243150] |