n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 1 |
5 | 15 |
6 | 180 |
7 | 2100 |
8 | 25235 |
9 | 319410 |
10 | 4299750 |
11 | 61815600 |
12 | 950524575 |
13 | 15633092475 |
14 | 274749725250 |
15 | 5151569172750 |
16 | 102831791687625 |
17 | 2179782464359500 |
18 | 48933251188321500 |
19 | 1160002995644493000 |
20 | 28956069155772383625 |
21 | 759014081927743516875 |
[1,0,0,0,1,15,180,2100,25235,319410,4299750, 61815600,950524575,15633092475,274749725250, 5151569172750,102831791687625,2179782464359500, 48933251188321500,1160002995644493000, 28956069155772383625,759014081927743516875] |