n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 1 |
5 | 1 |
6 | 1 |
7 | 2 |
8 | 5 |
9 | 15 |
10 | 64 |
11 | 331 |
12 | 2150 |
13 | 15817 |
14 | 127194 |
15 | 1077639 |
16 | 9466983 |
17 | 85252938 |
18 | 782238933 |
19 | 7283470324 |
20 | 68639621442 |
21 | 653492361220 |
22 | 6276834750665 |
23 | 60759388837299 |
24 | 592227182125701 |
25 | 5808446697002391 |
26 | 57289008242377068 |
27 | 567939935463185078 |
[0,0,0,1,1,1,2,5,15,64,331,2150,15817,127194, 1077639,9466983,85252938,782238933,7283470324, 68639621442,653492361220,6276834750665, 60759388837299,592227182125701,5808446697002391, 57289008242377068,567939935463185078] |