n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 20 |
5 | 73 |
6 | 283 |
7 | 1149 |
8 | 4833 |
9 | 20901 |
10 | 92406 |
11 | 415878 |
12 | 1899153 |
13 | 8778193 |
14 | 40988834 |
15 | 193056506 |
16 | 916091727 |
17 | 4375298013 |
18 | 21015823762 |
19 | 101454449878 |
20 | 491976470648 |
21 | 2395332765741 |
22 | 11704830457167 |
[0,1,2,6,20,73,283,1149,4833,20901,92406,415878, 1899153,8778193,40988834,193056506,916091727, 4375298013,21015823762,101454449878,491976470648, 2395332765741,11704830457167] |