n | a(n) |
---|---|
2 | 1 |
3 | 2 |
4 | 9 |
5 | 54 |
6 | 374 |
7 | 2820 |
8 | 22485 |
9 | 186494 |
10 | 1592778 |
11 | 13914108 |
12 | 123750874 |
13 | 1116809628 |
14 | 10201516332 |
15 | 94140605832 |
16 | 876332565837 |
17 | 8219124900558 |
18 | 77594375595266 |
19 | 736785675010380 |
20 | 7031930543228910 |
21 | 67420537625021460 |
22 | 649070964647075700 |
[1,2,9,54,374,2820,22485,186494,1592778,13914108, 123750874,1116809628,10201516332,94140605832, 876332565837,8219124900558,77594375595266, 736785675010380,7031930543228910, 67420537625021460,649070964647075700] |