n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 6 |
3 | 72 |
4 | 576 |
5 | 3840 |
6 | 23040 |
7 | 129024 |
8 | 688128 |
9 | 3538944 |
10 | 17694720 |
11 | 86507520 |
12 | 415236096 |
13 | 1962934272 |
14 | 9160359936 |
15 | 42278584320 |
16 | 193273528320 |
17 | 876173328384 |
18 | 3942779977728 |
19 | 17626545782784 |
20 | 78340203479040 |
21 | 346346162749440 |
[0,0,6,72,576,3840,23040,129024,688128,3538944, 17694720,86507520,415236096,1962934272,9160359936, 42278584320,193273528320,876173328384, 3942779977728,17626545782784,78340203479040, 346346162749440] |