n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 1 |
5 | 2 |
6 | 6 |
7 | 12 |
8 | 35 |
9 | 70 |
10 | 204 |
11 | 408 |
12 | 1189 |
13 | 2378 |
14 | 6930 |
15 | 13860 |
16 | 40391 |
17 | 80782 |
18 | 235416 |
19 | 470832 |
20 | 1372105 |
21 | 2744210 |
22 | 7997214 |
23 | 15994428 |
24 | 46611179 |
25 | 93222358 |
26 | 271669860 |
27 | 543339720 |
28 | 1583407981 |
29 | 3166815962 |
30 | 9228778026 |
31 | 18457556052 |
32 | 53789260175 |
33 | 107578520350 |
[0,0,0,1,2,6,12,35,70,204,408,1189,2378,6930, 13860,40391,80782,235416,470832,1372105,2744210, 7997214,15994428,46611179,93222358,271669860, 543339720,1583407981,3166815962,9228778026, 18457556052,53789260175,107578520350] |