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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 34 |
| 5 | 171 |
| 6 | 1029 |
| 7 | 7203 |
| 8 | 57626 |
| 9 | 518642 |
| 10 | 5186426 |
| 11 | 57050688 |
| 12 | 684608262 |
| 13 | 8899907410 |
| 14 | 124598703740 |
| 15 | 1868980556112 |
| 16 | 29903688897799 |
| 17 | 508362711262594 |
| 18 | 9150528802726695 |
| 19 | 173860047251807206 |
| 20 | 3477200945036144130 |
[1,2,8,34,171,1029,7203,57626,518642,5186426, 57050688,684608262,8899907410,124598703740, 1868980556112,29903688897799,508362711262594, 9150528802726695,173860047251807206, 3477200945036144130] |