n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 6 |
4 | 26 |
5 | 114 |
6 | 526 |
7 | 2502 |
8 | 12194 |
9 | 60570 |
10 | 305526 |
11 | 1560798 |
12 | 8058714 |
13 | 41987106 |
14 | 220470942 |
15 | 1165553718 |
16 | 6198683090 |
17 | 33140219946 |
18 | 178012804678 |
19 | 960232902606 |
20 | 5199384505226 |
21 | 28250295397170 |
22 | 153977094874862 |
23 | 841656387060006 |
[1,0,2,6,26,114,526,2502,12194,60570,305526, 1560798,8058714,41987106,220470942,1165553718, 6198683090,33140219946,178012804678,960232902606, 5199384505226,28250295397170,153977094874862, 841656387060006] |