n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 7 |
5 | 30 |
6 | 163 |
7 | 1056 |
8 | 7919 |
9 | 67304 |
10 | 639384 |
11 | 6713531 |
12 | 77205602 |
13 | 965070018 |
14 | 13028445232 |
15 | 188912455861 |
16 | 2928143065835 |
17 | 48314360586265 |
18 | 845501310259628 |
19 | 15641774239803108 |
20 | 305014597676160594 |
21 | 6252799252361292174 |
[1,1,1,2,7,30,163,1056,7919,67304,639384,6713531, 77205602,965070018,13028445232,188912455861, 2928143065835,48314360586265,845501310259628, 15641774239803108,305014597676160594, 6252799252361292174] |