n | a(n) |
---|---|
0 | 1 |
1 | 20 |
2 | 75456 |
3 | 222049714176 |
4 | 1446859308630697574400 |
5 | 47680530046593302430474043392000000 |
6 | 15747911603441625571224989926437024694272000000000000 |
[1,20,75456,222049714176,1446859308630697574400, 47680530046593302430474043392000000, 15747911603441625571224989926437024694272000000000\ 000] |