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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 82 |
| 4 | 657 |
| 5 | 5258 |
| 6 | 42066 |
| 7 | 336529 |
| 8 | 2692234 |
| 9 | 21537874 |
| 10 | 172302993 |
| 11 | 1378423946 |
| 12 | 11027391570 |
| 13 | 88219132561 |
| 14 | 705753060490 |
| 15 | 5646024483922 |
| 16 | 45168195871377 |
| 17 | 361345566971018 |
| 18 | 2890764535768146 |
| 19 | 23126116286145169 |
| 20 | 185008930289161354 |
[1,10,82,657,5258,42066,336529,2692234,21537874, 172302993,1378423946,11027391570,88219132561, 705753060490,5646024483922,45168195871377, 361345566971018,2890764535768146, 23126116286145169,185008930289161354] |