n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 2 |
4 | 6 |
5 | 24 |
6 | 80 |
7 | 208 |
8 | 922 |
9 | 2310 |
10 | 8794 |
11 | 26000 |
12 | 86632 |
13 | 274120 |
14 | 893552 |
15 | 2837882 |
16 | 9254642 |
17 | 29470852 |
18 | 95567342 |
19 | 306155908 |
20 | 987994256 |
21 | 3174707284 |
22 | 10228816628 |
23 | 32893256236 |
24 | 105937526030 |
25 | 340778467916 |
26 | 1097194416030 |
27 | 3530389210580 |
28 | 11364292475448 |
29 | 36571646955122 |
30 | 117713073900332 |
[1,0,2,2,6,24,80,208,922,2310,8794,26000,86632, 274120,893552,2837882,9254642,29470852,95567342, 306155908,987994256,3174707284,10228816628, 32893256236,105937526030,340778467916, 1097194416030,3530389210580,11364292475448, 36571646955122,117713073900332] |