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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 17 |
| 4 | 151 |
| 5 | 1824 |
| 6 | 27541 |
| 7 | 494997 |
| 8 | 10273039 |
| 9 | 241217147 |
| 10 | 6314907390 |
| 11 | 182283959604 |
| 12 | 5750796304553 |
| 13 | 196865960240416 |
| 14 | 7268410972604665 |
| 15 | 287920792767378837 |
| 16 | 12181570018235995359 |
| 17 | 548274960053921957856 |
[1,1,3,17,151,1824,27541,494997,10273039, 241217147,6314907390,182283959604,5750796304553, 196865960240416,7268410972604665, 287920792767378837,12181570018235995359, 548274960053921957856] |