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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 13 |
| 2 | 75 |
| 3 | 437 |
| 4 | 2547 |
| 5 | 14845 |
| 6 | 86523 |
| 7 | 504293 |
| 8 | 2939235 |
| 9 | 17131117 |
| 10 | 99847467 |
| 11 | 581953685 |
| 12 | 3391874643 |
| 13 | 19769294173 |
| 14 | 115223890395 |
| 15 | 671574048197 |
| 16 | 3914220398787 |
| 17 | 22813748344525 |
| 18 | 132968269668363 |
| 19 | 774995869665653 |
| 20 | 4517006948325555 |
| 21 | 26327045820287677 |
| 22 | 153445267973400507 |
[3,13,75,437,2547,14845,86523,504293,2939235, 17131117,99847467,581953685,3391874643, 19769294173,115223890395,671574048197, 3914220398787,22813748344525,132968269668363, 774995869665653,4517006948325555, 26327045820287677,153445267973400507] |