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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 15 |
| 4 | 139 |
| 5 | 2387 |
| 6 | 79115 |
| 7 | 5148411 |
| 8 | 664332843 |
| 9 | 170744863371 |
| 10 | 87593505706987 |
| 11 | 89783692196468907 |
| 12 | 183966962290186844267 |
| 13 | 753712824966410639243755 |
| 14 | 6175169543791440589003293035 |
| 15 | 101180154484297968338398947674219 |
[1,1,3,15,139,2387,79115,5148411,664332843, 170744863371,87593505706987,89783692196468907, 183966962290186844267,753712824966410639243755, 6175169543791440589003293035, 101180154484297968338398947674219] |