n | a(n) |
---|---|
0 | -1 |
1 | 0 |
2 | 2 |
3 | 11 |
4 | 49 |
5 | 204 |
6 | 825 |
7 | 3289 |
8 | 13013 |
9 | 51272 |
10 | 201552 |
11 | 791350 |
12 | 3105322 |
13 | 12183560 |
14 | 47805615 |
15 | 187623765 |
16 | 736618125 |
17 | 2893125840 |
18 | 11367801060 |
19 | 44686512090 |
20 | 175739405790 |
21 | 691437981000 |
22 | 2721606268290 |
23 | 10717182330426 |
24 | 42219554975874 |
25 | 166386610183024 |
26 | 655976895434000 |
[-1,0,2,11,49,204,825,3289,13013,51272,201552, 791350,3105322,12183560,47805615,187623765, 736618125,2893125840,11367801060,44686512090, 175739405790,691437981000,2721606268290, 10717182330426,42219554975874,166386610183024, 655976895434000] |