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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 74 |
| 4 | 2414 |
| 5 | 140274 |
| 6 | 12780984 |
| 7 | 1681732464 |
| 8 | 301837526640 |
| 9 | 70870658200560 |
| 10 | 21085710340560480 |
| 11 | 7752245316736838400 |
| 12 | 3451176556978487944320 |
| 13 | 1829509243576458084345600 |
| 14 | 1138750671753488468994278400 |
[1,5,74,2414,140274,12780984,1681732464, 301837526640,70870658200560,21085710340560480, 7752245316736838400,3451176556978487944320, 1829509243576458084345600, 1138750671753488468994278400] |