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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 34 |
| 3 | 6 |
| 4 | 185 |
| 5 | 627 |
| 6 | 3417 |
| 7 | 14422 |
| 8 | 73961 |
| 9 | 354200 |
| 10 | 1772595 |
| 11 | 8807624 |
| 12 | 44087860 |
| 13 | 218942205 |
| 14 | 1093100404 |
| 15 | 5447861031 |
| 16 | 27173970577 |
| 17 | 135547796845 |
| 18 | 676389434363 |
| 19 | 3374295032672 |
| 20 | 16836823878509 |
| 21 | 84007635799139 |
| 22 | 419167042007303 |
[0,34,6,185,627,3417,14422,73961,354200,1772595, 8807624,44087860,218942205,1093100404,5447861031, 27173970577,135547796845,676389434363, 3374295032672,16836823878509,84007635799139, 419167042007303] |