n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 2 |
5 | 4 |
6 | 10 |
7 | 28 |
8 | 127 |
9 | 686 |
10 | 4975 |
11 | 42529 |
12 | 420948 |
13 | 4622509 |
14 | 55670332 |
15 | 726738971 |
16 | 10217376792 |
17 | 153848448652 |
18 | 2470073249960 |
19 | 42120966152815 |
20 | 760282326662191 |
21 | 14481561464994821 |
22 | 290289454462745374 |
23 | 6108699653117045614 |
[1,1,1,2,4,10,28,127,686,4975,42529,420948, 4622509,55670332,726738971,10217376792, 153848448652,2470073249960,42120966152815, 760282326662191,14481561464994821, 290289454462745374,6108699653117045614] |