n | a(n) |
---|---|
1 | 4 |
2 | 20 |
3 | 264 |
4 | 80104 |
5 | 464655217384 |
6 | 4220043418839499735652372200 |
7 | 176673930781452287254786178869471177643231519559311590043612856 |
[4,20,264,80104,464655217384, 4220043418839499735652372200, 17667393078145228725478617886947117764323151955931\ 1590043612856] |