n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 5 |
5 | 15 |
6 | 51 |
7 | 191 |
8 | 773 |
9 | 3338 |
10 | 15243 |
11 | 73131 |
12 | 366815 |
13 | 1916260 |
14 | 10394665 |
15 | 58404853 |
16 | 339223859 |
17 | 2033188222 |
18 | 12556915219 |
19 | 79807729238 |
20 | 521399203037 |
21 | 3497978659977 |
22 | 24076009827669 |
23 | 169865542733652 |
24 | 1227553152971419 |
25 | 9079751310622581 |
26 | 68692742886823205 |
[0,1,1,2,5,15,51,191,773,3338,15243,73131,366815, 1916260,10394665,58404853,339223859,2033188222, 12556915219,79807729238,521399203037, 3497978659977,24076009827669,169865542733652, 1227553152971419,9079751310622581, 68692742886823205] |