n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 3 |
5 | 12 |
6 | 44 |
7 | 170 |
8 | 651 |
9 | 2520 |
10 | 9752 |
11 | 37854 |
12 | 147070 |
13 | 572264 |
14 | 2229096 |
15 | 8692788 |
16 | 33933459 |
17 | 132594480 |
18 | 518584880 |
19 | 2029976630 |
20 | 7952706234 |
21 | 31179618184 |
22 | 122331419080 |
23 | 480283635468 |
24 | 1886828198398 |
[0,0,1,3,12,44,170,651,2520,9752,37854,147070, 572264,2229096,8692788,33933459,132594480, 518584880,2029976630,7952706234,31179618184, 122331419080,480283635468,1886828198398] |