n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 2 |
4 | 5 |
5 | 15 |
6 | 39 |
7 | 104 |
8 | 272 |
9 | 714 |
10 | 1869 |
11 | 4895 |
12 | 12815 |
13 | 33552 |
14 | 87840 |
15 | 229970 |
16 | 602069 |
17 | 1576239 |
18 | 4126647 |
19 | 10803704 |
20 | 28284464 |
21 | 74049690 |
22 | 193864605 |
23 | 507544127 |
24 | 1328767775 |
25 | 3478759200 |
26 | 9107509824 |
27 | 23843770274 |
28 | 62423800997 |
29 | 163427632719 |
[0,0,2,5,15,39,104,272,714,1869,4895,12815,33552, 87840,229970,602069,1576239,4126647,10803704, 28284464,74049690,193864605,507544127,1328767775, 3478759200,9107509824,23843770274,62423800997, 163427632719] |