n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 3 |
4 | 12 |
5 | 40 |
6 | 195 |
7 | 861 |
8 | 5488 |
9 | 31032 |
10 | 247005 |
11 | 1706815 |
12 | 16302396 |
13 | 133131648 |
14 | 1483518127 |
15 | 13978823145 |
16 | 178022175360 |
17 | 1901119947856 |
18 | 27237392830233 |
19 | 325091511083547 |
20 | 5175104637744460 |
21 | 68269217327545080 |
22 | 1195449171318970491 |
[0,1,3,12,40,195,861,5488,31032,247005,1706815, 16302396,133131648,1483518127,13978823145, 178022175360,1901119947856,27237392830233, 325091511083547,5175104637744460, 68269217327545080,1195449171318970491] |