n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 3 |
4 | 12 |
5 | 25 |
6 | 76 |
7 | 182 |
8 | 504 |
9 | 1275 |
10 | 3410 |
11 | 8811 |
12 | 23256 |
13 | 60580 |
14 | 159094 |
15 | 415715 |
16 | 1089648 |
17 | 2850645 |
18 | 7466468 |
19 | 19541994 |
20 | 51170460 |
21 | 133951675 |
22 | 350713222 |
23 | 918141623 |
24 | 2403786672 |
25 | 6293097000 |
26 | 16475700746 |
27 | 43133687427 |
28 | 112925875764 |
[0,0,2,3,12,25,76,182,504,1275,3410,8811,23256, 60580,159094,415715,1089648,2850645,7466468, 19541994,51170460,133951675,350713222,918141623, 2403786672,6293097000,16475700746,43133687427, 112925875764] |