n | a(n) |
---|---|
1 | 1 |
2 | 6 |
3 | 12 |
4 | 96 |
5 | 1560 |
6 | 4848 |
7 | 28848 |
8 | 248352 |
9 | 1446240 |
10 | 12905664 |
11 | 99071040 |
12 | 649236480 |
13 | 4924099200 |
14 | 49007023872 |
15 | 304778309376 |
16 | 2301818168832 |
17 | 18389782387200 |
18 | 138110895596544 |
19 | 1094304243348480 |
20 | 8691945066848256 |
21 | 68039592521668608 |
[1,6,12,96,1560,4848,28848,248352,1446240, 12905664,99071040,649236480,4924099200, 49007023872,304778309376,2301818168832, 18389782387200,138110895596544,1094304243348480, 8691945066848256,68039592521668608] |