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| n | a(n) |
|---|---|
| 1 | 747 |
| 2 | 2988 |
| 3 | 12915 |
| 4 | 57978 |
| 5 | 262494 |
| 6 | 1192149 |
| 7 | 5419521 |
| 8 | 24648309 |
| 9 | 112122162 |
| 10 | 510068277 |
| 11 | 2320483212 |
| 12 | 10556851032 |
| 13 | 48027819627 |
| 14 | 218500501500 |
| 15 | 994059717210 |
| 16 | 4522438970532 |
| 17 | 20574677747547 |
| 18 | 93603784061979 |
| 19 | 425847190478391 |
[747,2988,12915,57978,262494,1192149,5419521, 24648309,112122162,510068277,2320483212, 10556851032,48027819627,218500501500,994059717210, 4522438970532,20574677747547,93603784061979, 425847190478391] |