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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 59 |
| 3 | 812 |
| 4 | 14389 |
| 5 | 312114 |
| 6 | 8011695 |
| 7 | 237560280 |
| 8 | 7990901865 |
| 9 | 300659985630 |
| 10 | 12511934225955 |
| 11 | 570616907588100 |
| 12 | 28301322505722525 |
| 13 | 1516683700464669450 |
| 14 | 87336792132539066775 |
| 15 | 5378036128829898836400 |
| 16 | 352652348707389385916625 |
| 17 | 24533212082483855129037750 |
[1,6,59,812,14389,312114,8011695,237560280, 7990901865,300659985630,12511934225955, 570616907588100,28301322505722525, 1516683700464669450,87336792132539066775, 5378036128829898836400,352652348707389385916625, 24533212082483855129037750] |