n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 3 |
5 | 30 |
6 | 195 |
7 | 1050 |
8 | 5103 |
9 | 23310 |
10 | 102315 |
11 | 437250 |
12 | 1834503 |
13 | 7597590 |
14 | 31175235 |
15 | 127067850 |
16 | 515396703 |
17 | 2083011870 |
18 | 8396420955 |
19 | 33779000850 |
20 | 135696347703 |
21 | 544527210150 |
22 | 2183335871475 |
23 | 8749027724250 |
24 | 35043169903503 |
25 | 140313869216430 |
26 | 561679070838795 |
[0,0,0,3,30,195,1050,5103,23310,102315,437250, 1834503,7597590,31175235,127067850,515396703, 2083011870,8396420955,33779000850,135696347703, 544527210150,2183335871475,8749027724250, 35043169903503,140313869216430,561679070838795] |