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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 10 |
| 3 | 49 |
| 4 | 272 |
| 5 | 1617 |
| 6 | 10082 |
| 7 | 65101 |
| 8 | 431635 |
| 9 | 2921557 |
| 10 | 20104828 |
| 11 | 140240820 |
| 12 | 989366180 |
| 13 | 7046832503 |
| 14 | 50604822586 |
| 15 | 365995915453 |
| 16 | 2663552184585 |
| 17 | 19490777248544 |
| 18 | 143322830835474 |
| 19 | 1058514890796268 |
| 20 | 7848460747315854 |
| 21 | 58400364116985559 |
| 22 | 435963301942052908 |
[1,2,10,49,272,1617,10082,65101,431635,2921557, 20104828,140240820,989366180,7046832503, 50604822586,365995915453,2663552184585, 19490777248544,143322830835474,1058514890796268, 7848460747315854,58400364116985559, 435963301942052908] |