n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 2 |
4 | 1 |
5 | 9 |
6 | 22 |
7 | 38 |
8 | 143 |
9 | 676 |
10 | 1815 |
11 | 7434 |
12 | 22452 |
13 | 87485 |
14 | 290873 |
15 | 1092072 |
16 | 3894381 |
17 | 13988849 |
18 | 49672279 |
19 | 184745525 |
20 | 677809709 |
21 | 2495632892 |
22 | 9260315018 |
23 | 34280441347 |
24 | 127419049587 |
25 | 474867366809 |
26 | 1781565475308 |
27 | 6700749901259 |
28 | 25230023849115 |
29 | 95215110677472 |
[1,0,2,1,9,22,38,143,676,1815,7434,22452,87485, 290873,1092072,3894381,13988849,49672279, 184745525,677809709,2495632892,9260315018, 34280441347,127419049587,474867366809, 1781565475308,6700749901259,25230023849115, 95215110677472] |