n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 41 |
3 | 126 |
4 | 1526 |
5 | 7854 |
6 | 63629 |
7 | 400789 |
8 | 2870629 |
9 | 19254504 |
10 | 133376760 |
11 | 909578760 |
12 | 6249172910 |
13 | 42785312510 |
14 | 293403088510 |
15 | 2010553849020 |
16 | 13781960765020 |
17 | 94458627485820 |
18 | 647442212896270 |
19 | 4437595353800270 |
20 | 30415849505902910 |
21 | 208472981440853160 |
22 | 1428896115173689560 |
[1,1,41,126,1526,7854,63629,400789,2870629, 19254504,133376760,909578760,6249172910, 42785312510,293403088510,2010553849020, 13781960765020,94458627485820,647442212896270, 4437595353800270,30415849505902910, 208472981440853160,1428896115173689560] |