n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 5 |
3 | 20 |
4 | 70 |
5 | 221 |
6 | 646 |
7 | 1772 |
8 | 4614 |
9 | 11490 |
10 | 27537 |
11 | 63808 |
12 | 143514 |
13 | 314279 |
14 | 671872 |
15 | 1405260 |
16 | 2881030 |
17 | 5799093 |
18 | 11476452 |
19 | 22357584 |
20 | 42922558 |
21 | 81284699 |
22 | 151974124 |
23 | 280739800 |
24 | 512761178 |
25 | 926568075 |
26 | 1657448779 |
27 | 2936506316 |
28 | 5155349836 |
29 | 8972488674 |
30 | 15487146900 |
[0,1,5,20,70,221,646,1772,4614,11490,27537,63808, 143514,314279,671872,1405260,2881030,5799093, 11476452,22357584,42922558,81284699,151974124, 280739800,512761178,926568075,1657448779, 2936506316,5155349836,8972488674,15487146900] |