n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 40 |
5 | 440 |
6 | 5952 |
7 | 97104 |
8 | 1888640 |
9 | 42480000 |
10 | 1082119680 |
11 | 30814080000 |
12 | 970187827200 |
13 | 33461288899584 |
14 | 1254539018571776 |
15 | 50803163905751040 |
16 | 2209862882578300928 |
17 | 102761280728930287616 |
18 | 5087062588875762696192 |
19 | 267101579060996713611264 |
[0,1,2,6,40,440,5952,97104,1888640,42480000, 1082119680,30814080000,970187827200, 33461288899584,1254539018571776,50803163905751040, 2209862882578300928,102761280728930287616, 5087062588875762696192,267101579060996713611264] |