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| n | a(n) |
|---|---|
| 1 | 12339 |
| 2 | 19119 |
| 3 | 30681 |
| 4 | 53739 |
| 5 | 127689 |
| 6 | 322275 |
| 7 | 878625 |
| 8 | 2967411 |
| 9 | 9800745 |
| 10 | 32238603 |
| 11 | 121975089 |
| 12 | 436928547 |
| 13 | 1519783929 |
| 14 | 5949509979 |
| 15 | 21894837441 |
| 16 | 77688357939 |
| 17 | 307915900809 |
| 18 | 1145251722315 |
| 19 | 4096740213585 |
| 20 | 16319916055011 |
| 21 | 60974970119385 |
[12339,19119,30681,53739,127689,322275,878625, 2967411,9800745,32238603,121975089,436928547, 1519783929,5949509979,21894837441,77688357939, 307915900809,1145251722315,4096740213585, 16319916055011,60974970119385] |