n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 0 |
7 | 3 |
8 | 15 |
9 | 20 |
10 | 60 |
11 | 140 |
12 | 175 |
13 | 360 |
14 | 720 |
15 | 891 |
16 | 1935 |
17 | 4455 |
18 | 5775 |
19 | 13895 |
20 | 32487 |
21 | 42484 |
22 | 97188 |
23 | 216580 |
24 | 282165 |
25 | 632706 |
26 | 1418514 |
27 | 1863880 |
28 | 4259520 |
29 | 9690000 |
30 | 12833436 |
31 | 29366007 |
32 | 66481107 |
33 | 88256147 |
34 | 200571107 |
35 | 452679491 |
[0,0,0,0,0,0,3,15,20,60,140,175,360,720,891,1935, 4455,5775,13895,32487,42484,97188,216580,282165, 632706,1418514,1863880,4259520,9690000,12833436, 29366007,66481107,88256147,200571107,452679491] |