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| n | a(n) |
|---|---|
| 1 | 12 |
| 2 | 59 |
| 3 | 453 |
| 4 | 3572 |
| 5 | 30269 |
| 6 | 259011 |
| 7 | 2278003 |
| 8 | 20081717 |
| 9 | 178468093 |
| 10 | 1587202009 |
| 11 | 14147804875 |
| 12 | 126135696317 |
| 13 | 1125282491561 |
| 14 | 10039469984309 |
| 15 | 89585462173947 |
| 16 | 799412950981660 |
| 17 | 7133898167065735 |
| 18 | 63662603102524287 |
| 19 | 568130626858337409 |
[12,59,453,3572,30269,259011,2278003,20081717, 178468093,1587202009,14147804875,126135696317, 1125282491561,10039469984309,89585462173947, 799412950981660,7133898167065735, 63662603102524287,568130626858337409] |