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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 47 |
| 4 | 641 |
| 5 | 11389 |
| 6 | 248749 |
| 7 | 6439075 |
| 8 | 192621953 |
| 9 | 6536413529 |
| 10 | 248040482741 |
| 11 | 10407123510871 |
| 12 | 478360626529345 |
| 13 | 23903857657114837 |
| 14 | 1290205338991689821 |
| 15 | 74803882225482661259 |
| 16 | 4636427218380366565889 |
| 17 | 305927317398343461908785 |
| 18 | 21410426012751471702223333 |
[1,1,5,47,641,11389,248749,6439075,192621953, 6536413529,248040482741,10407123510871, 478360626529345,23903857657114837, 1290205338991689821,74803882225482661259, 4636427218380366565889,305927317398343461908785, 21410426012751471702223333] |