n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 3 |
4 | 9 |
5 | 70 |
6 | 117 |
7 | 503 |
8 | 648 |
9 | 1078 |
10 | 12868 |
11 | 41235 |
12 | 178650 |
13 | 377670 |
14 | 394301 |
15 | 546185 |
16 | 2600672 |
17 | 8729780 |
18 | 41318679 |
19 | 83367169 |
20 | 525961060 |
21 | 561571346 |
22 | 1556964264 |
23 | 1868773845 |
24 | 15139200289 |
25 | 27297789005 |
26 | 30324107039 |
27 | 56699922000 |
[1,1,2,3,9,70,117,503,648,1078,12868,41235,178650, 377670,394301,546185,2600672,8729780,41318679, 83367169,525961060,561571346,1556964264, 1868773845,15139200289,27297789005,30324107039, 56699922000] |