n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 8 |
4 | 49 |
5 | 294 |
6 | 1893 |
7 | 13572 |
8 | 109345 |
9 | 985898 |
10 | 9863077 |
11 | 108503064 |
12 | 1302057249 |
13 | 16926789294 |
14 | 236975148421 |
15 | 3554627439308 |
16 | 56874039487681 |
17 | 966858672273618 |
18 | 17403456103022277 |
19 | 330665665961879712 |
20 | 6613313319247031425 |
21 | 138879579704207582870 |
[0,0,1,8,49,294,1893,13572,109345,985898,9863077, 108503064,1302057249,16926789294,236975148421, 3554627439308,56874039487681,966858672273618, 17403456103022277,330665665961879712, 6613313319247031425,138879579704207582870] |