n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 1 |
4 | 4 |
5 | 13 |
6 | 40 |
7 | 131 |
8 | 424 |
9 | 1428 |
10 | 4848 |
11 | 16795 |
12 | 58740 |
13 | 208011 |
14 | 742768 |
15 | 2674425 |
16 | 9694416 |
17 | 35357669 |
18 | 129643320 |
19 | 477638699 |
20 | 1767258324 |
21 | 6564120287 |
22 | 24466250224 |
23 | 91482563639 |
24 | 343059554440 |
25 | 1289904147310 |
26 | 4861946193440 |
27 | 18367353070722 |
28 | 69533550173100 |
29 | 263747951750359 |
[1,0,1,4,13,40,131,424,1428,4848,16795,58740, 208011,742768,2674425,9694416,35357669,129643320, 477638699,1767258324,6564120287,24466250224, 91482563639,343059554440,1289904147310, 4861946193440,18367353070722,69533550173100, 263747951750359] |