n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 25 |
5 | 135 |
6 | 909 |
7 | 7417 |
8 | 71698 |
9 | 806968 |
10 | 10427825 |
11 | 152915697 |
12 | 2519879761 |
13 | 46276398129 |
14 | 940296067422 |
15 | 21007099850230 |
16 | 513172107841525 |
17 | 13640345170943527 |
18 | 392780078386164389 |
19 | 12204609567437300313 |
20 | 407757149671568266678 |
21 | 14600807659376773500696 |
[1,1,2,6,25,135,909,7417,71698,806968,10427825, 152915697,2519879761,46276398129,940296067422, 21007099850230,513172107841525,13640345170943527, 392780078386164389,12204609567437300313, 407757149671568266678,14600807659376773500696] |