n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 6 |
4 | 21 |
5 | 73 |
6 | 234 |
7 | 691 |
8 | 1910 |
9 | 5019 |
10 | 12690 |
11 | 31147 |
12 | 74694 |
13 | 175843 |
14 | 407810 |
15 | 934179 |
16 | 2117958 |
17 | 4759915 |
18 | 10617234 |
19 | 23527867 |
20 | 51839462 |
21 | 113639955 |
22 | 247988802 |
23 | 538968691 |
24 | 1167065766 |
25 | 2518680283 |
26 | 5419041554 |
27 | 11626611531 |
28 | 24880612230 |
[1,2,6,21,73,234,691,1910,5019,12690,31147,74694, 175843,407810,934179,2117958,4759915,10617234, 23527867,51839462,113639955,247988802,538968691, 1167065766,2518680283,5419041554,11626611531, 24880612230] |