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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 14 |
| 5 | 85 |
| 6 | 642 |
| 7 | 5782 |
| 8 | 60484 |
| 9 | 720495 |
| 10 | 9627210 |
| 11 | 142583430 |
| 12 | 2318126196 |
| 13 | 41042117558 |
| 14 | 786002475244 |
| 15 | 16189215818220 |
| 16 | 356847596226840 |
| 17 | 8381418010559225 |
| 18 | 208967274455769810 |
| 19 | 5511890008010697306 |
[1,1,3,14,85,642,5782,60484,720495,9627210, 142583430,2318126196,41042117558,786002475244, 16189215818220,356847596226840,8381418010559225, 208967274455769810,5511890008010697306] |