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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 55 |
| 4 | 2439 |
| 5 | 181711 |
| 6 | 19987863 |
| 7 | 3019344175 |
| 8 | 597283032279 |
| 9 | 149571915236911 |
| 10 | 46218017081300823 |
| 11 | 17270884763586798895 |
| 12 | 7677911426885078360919 |
| 13 | 4005536546107407400763311 |
| 14 | 2423921346754787141028928983 |
| 15 | 1684444421472099056470715447215 |
| 16 | 1332493495574767096115773084870359 |
| 17 | 1190644894731926448479445174157508911 |
| 18 | 1193491123893325068744832273320725408343 |
[1,1,3,55,2439,181711,19987863,3019344175, 597283032279,149571915236911,46218017081300823, 17270884763586798895,7677911426885078360919, 4005536546107407400763311, 2423921346754787141028928983, 1684444421472099056470715447215, 1332493495574767096115773084870359, 1190644894731926448479445174157508911, 1193491123893325068744832273320725408343] |