n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 2 |
4 | 17 |
5 | 121 |
6 | 891 |
7 | 7155 |
8 | 63351 |
9 | 617463 |
10 | 6590727 |
11 | 76589127 |
12 | 963486567 |
13 | 13052781927 |
14 | 189537379047 |
15 | 2937560365287 |
16 | 48409889869287 |
17 | 845393769958887 |
18 | 15596602532173287 |
19 | 303139660882458087 |
20 | 6191620542649779687 |
[0,0,0,2,17,121,891,7155,63351,617463,6590727, 76589127,963486567,13052781927,189537379047, 2937560365287,48409889869287,845393769958887, 15596602532173287,303139660882458087, 6191620542649779687] |