n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 36 |
5 | 240 |
6 | 1800 |
7 | 15960 |
8 | 164640 |
9 | 1905120 |
10 | 24343200 |
11 | 342619200 |
12 | 5269017600 |
13 | 87749101440 |
14 | 1573083832320 |
15 | 30218175187200 |
16 | 619256461824000 |
17 | 13483023576422400 |
18 | 310821905134540800 |
19 | 7563477205380096000 |
20 | 193736838233562624000 |
21 | 5210638309494858240000 |
[1,1,2,6,36,240,1800,15960,164640,1905120, 24343200,342619200,5269017600,87749101440, 1573083832320,30218175187200,619256461824000, 13483023576422400,310821905134540800, 7563477205380096000,193736838233562624000, 5210638309494858240000] |