n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 50 |
4 | 98 |
5 | 1830 |
6 | 4576 |
7 | 83950 |
8 | 236500 |
9 | 4211766 |
10 | 12903260 |
11 | 222377926 |
12 | 723722602 |
13 | 12136867530 |
14 | 41382435824 |
15 | 678060771778 |
16 | 2400028798290 |
17 | 38546050682278 |
18 | 140724756748476 |
19 | 2220907298526934 |
20 | 8323586858891766 |
21 | 129340015891714962 |
22 | 495838256186203600 |
[1,2,4,50,98,1830,4576,83950,236500,4211766, 12903260,222377926,723722602,12136867530, 41382435824,678060771778,2400028798290, 38546050682278,140724756748476,2220907298526934, 8323586858891766,129340015891714962, 495838256186203600] |