n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 12 |
3 | 55 |
4 | 276 |
5 | 1464 |
6 | 8058 |
7 | 45543 |
8 | 262626 |
9 | 1538607 |
10 | 9130446 |
11 | 54761628 |
12 | 331403447 |
13 | 2021021082 |
14 | 12407102937 |
15 | 76611488305 |
16 | 475493441604 |
17 | 2964664310319 |
18 | 18560063203353 |
19 | 116621922800283 |
20 | 735236268006654 |
[1,3,12,55,276,1464,8058,45543,262626,1538607, 9130446,54761628,331403447,2021021082,12407102937, 76611488305,475493441604,2964664310319, 18560063203353,116621922800283,735236268006654] |