n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 24 |
3 | 168 |
4 | 1680 |
5 | 23520 |
6 | 493920 |
7 | 15805440 |
8 | 790272000 |
9 | 62431488000 |
10 | 7866367488000 |
11 | 1589006232576000 |
12 | 516427025587200000 |
13 | 270607761407692800000 |
14 | 228934166150908108800000 |
15 | 312953005128291384729600000 |
16 | 691626141333523960252416000000 |
[1,4,24,168,1680,23520,493920,15805440,790272000, 62431488000,7866367488000,1589006232576000, 516427025587200000,270607761407692800000, 228934166150908108800000, 312953005128291384729600000, 691626141333523960252416000000] |