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| n | a(n) |
|---|---|
| 1 | 52 |
| 2 | 446 |
| 3 | 3396 |
| 4 | 26850 |
| 5 | 211374 |
| 6 | 1689732 |
| 7 | 13587804 |
| 8 | 109957140 |
| 9 | 893510530 |
| 10 | 7288331916 |
| 11 | 59637096784 |
| 12 | 489325754576 |
| 13 | 4024444316206 |
| 14 | 33167657580268 |
| 15 | 273853057747366 |
| 16 | 2264784856966600 |
| 17 | 18757225819498566 |
| 18 | 155553439876468586 |
[52,446,3396,26850,211374,1689732,13587804, 109957140,893510530,7288331916,59637096784, 489325754576,4024444316206,33167657580268, 273853057747366,2264784856966600, 18757225819498566,155553439876468586] |