n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 5 |
3 | 30 |
4 | 199 |
5 | 1355 |
6 | 9276 |
7 | 63565 |
8 | 435665 |
9 | 2986074 |
10 | 20466835 |
11 | 140281751 |
12 | 961505400 |
13 | 6590256025 |
14 | 45170286749 |
15 | 309601751190 |
16 | 2122041971551 |
17 | 14544692049635 |
18 | 99690802375860 |
19 | 683290924581349 |
20 | 4683345669693545 |
[0,1,5,30,199,1355,9276,63565,435665,2986074, 20466835,140281751,961505400,6590256025, 45170286749,309601751190,2122041971551, 14544692049635,99690802375860,683290924581349, 4683345669693545] |