n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 1 |
5 | 0 |
6 | 5 |
7 | 0 |
8 | 15 |
9 | 1 |
10 | 35 |
11 | 10 |
12 | 70 |
13 | 55 |
14 | 127 |
15 | 220 |
16 | 225 |
17 | 715 |
18 | 450 |
19 | 2003 |
20 | 1175 |
21 | 5025 |
22 | 3775 |
23 | 11650 |
24 | 12630 |
25 | 25850 |
26 | 40150 |
27 | 57475 |
28 | 118425 |
29 | 134883 |
30 | 325075 |
31 | 345090 |
32 | 840725 |
33 | 952195 |
34 | 2083888 |
35 | 2722455 |
36 | 5056055 |
37 | 7765010 |
38 | 12293890 |
39 | 21615771 |
40 | 30591685 |
41 | 58293475 |
[0,0,0,0,1,0,5,0,15,1,35,10,70,55,127,220,225,715, 450,2003,1175,5025,3775,11650,12630,25850,40150, 57475,118425,134883,325075,345090,840725,952195, 2083888,2722455,5056055,7765010,12293890,21615771, 30591685,58293475] |