n | a(n) |
---|---|
1 | 1 |
2 | 3 |
3 | 12 |
4 | 60 |
5 | 390 |
6 | 3320 |
7 | 35570 |
8 | 471620 |
9 | 7543118 |
10 | 142663878 |
11 | 3136936508 |
12 | 79061105312 |
13 | 2256802761948 |
14 | 72223691097344 |
[1,3,12,60,390,3320,35570,471620,7543118, 142663878,3136936508,79061105312,2256802761948, 72223691097344] |