n | a(n) |
---|---|
1 | 1 |
2 | 6 |
3 | 50 |
4 | 392 |
5 | 2970 |
6 | 22022 |
7 | 160888 |
8 | 1162800 |
9 | 8335338 |
10 | 59366450 |
11 | 420630210 |
12 | 2967563040 |
13 | 20861295000 |
14 | 146203657992 |
15 | 1021964428880 |
16 | 7127260128736 |
17 | 49606676100234 |
18 | 344658278690250 |
19 | 2390849931605590 |
20 | 16561583202364200 |
21 | 114577083158683530 |
22 | 791757148201073670 |
[1,6,50,392,2970,22022,160888,1162800,8335338, 59366450,420630210,2967563040,20861295000, 146203657992,1021964428880,7127260128736, 49606676100234,344658278690250,2390849931605590, 16561583202364200,114577083158683530, 791757148201073670] |