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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 40 |
| 3 | 1185 |
| 4 | 65270 |
| 5 | 4861126 |
| 6 | 445776670 |
| 7 | 48124064710 |
| 8 | 5952881626790 |
| 9 | 828544320379330 |
| 10 | 128058593506875627 |
| 11 | 21758230559633783765 |
| 12 | 4031357498037096661170 |
| 13 | 809070343591564791211705 |
| 14 | 174888309616496370413590235 |
| 15 | 40517215307075701804767255261 |
| 16 | 10017278630199891781122121185615 |
| 17 | 2632883558256463087445119555912870 |
| 18 | 733167697272377998186394054589647855 |
| 19 | 215641985221691590110546294934099963285 |
[1,5,40,1185,65270,4861126,445776670,48124064710, 5952881626790,828544320379330,128058593506875627, 21758230559633783765,4031357498037096661170, 809070343591564791211705, 174888309616496370413590235, 40517215307075701804767255261, 10017278630199891781122121185615, 2632883558256463087445119555912870, 733167697272377998186394054589647855, 215641985221691590110546294934099963285] |