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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 34 |
| 4 | 315 |
| 5 | 3741 |
| 6 | 54531 |
| 7 | 944035 |
| 8 | 18934763 |
| 9 | 431773963 |
| 10 | 11030464423 |
| 11 | 312023972228 |
| 12 | 9680623848325 |
| 13 | 326823162461823 |
| 14 | 11926991260987869 |
| 15 | 467837288974848642 |
| 16 | 19628089812933434547 |
| 17 | 877052336082168698715 |
| 18 | 41581946832665768549007 |
| 19 | 2084818230218269733957646 |
[1,1,5,34,315,3741,54531,944035,18934763, 431773963,11030464423,312023972228,9680623848325, 326823162461823,11926991260987869, 467837288974848642,19628089812933434547, 877052336082168698715,41581946832665768549007, 2084818230218269733957646] |