n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 10 |
4 | 32 |
5 | 120 |
6 | 513 |
7 | 2455 |
8 | 13040 |
9 | 76440 |
10 | 492231 |
11 | 3465163 |
12 | 26530503 |
13 | 219754535 |
14 | 1959181266 |
15 | 18710532565 |
16 | 190588702776 |
17 | 2062664376064 |
18 | 23636408157551 |
19 | 285900639990875 |
20 | 3640199365715769 |
21 | 48665876423760247 |
[1,2,4,10,32,120,513,2455,13040,76440,492231, 3465163,26530503,219754535,1959181266,18710532565, 190588702776,2062664376064,23636408157551, 285900639990875,3640199365715769, 48665876423760247] |