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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 16 |
| 4 | 198 |
| 5 | 2927 |
| 6 | 50060 |
| 7 | 979361 |
| 8 | 21645853 |
| 9 | 534381060 |
| 10 | 14590180163 |
| 11 | 436814197446 |
| 12 | 14235563000269 |
| 13 | 501817445873045 |
| 14 | 19029286646922723 |
| 15 | 772532087068933899 |
| 16 | 33434018751249535666 |
| 17 | 1536767964161539414904 |
| 18 | 74769012084248550773909 |
[1,1,2,16,198,2927,50060,979361,21645853, 534381060,14590180163,436814197446,14235563000269, 501817445873045,19029286646922723, 772532087068933899,33434018751249535666, 1536767964161539414904,74769012084248550773909] |