n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 13 |
6 | 252 |
7 | 3740 |
8 | 51300 |
9 | 685419 |
10 | 9095856 |
11 | 120872850 |
12 | 1614234960 |
13 | 21697730835 |
14 | 293695935764 |
15 | 4003423965684 |
16 | 54944523689692 |
17 | 758990230992175 |
18 | 10548884795729280 |
19 | 147458773053913268 |
20 | 2072369440050644208 |
21 | 29271357456284966994 |
[0,0,0,0,13,252,3740,51300,685419,9095856, 120872850,1614234960,21697730835,293695935764, 4003423965684,54944523689692,758990230992175, 10548884795729280,147458773053913268, 2072369440050644208,29271357456284966994] |