n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 10 |
3 | 46 |
4 | 224 |
5 | 1202 |
6 | 7120 |
7 | 46366 |
8 | 329984 |
9 | 2551202 |
10 | 21306880 |
11 | 191252686 |
12 | 1836652544 |
13 | 18793429202 |
14 | 204154071040 |
15 | 2346705139006 |
16 | 28459289083904 |
17 | 363156549211202 |
18 | 4864231397785600 |
19 | 68237760828425326 |
20 | 1000569392347480064 |
21 | 15306487540377673202 |
[0,2,10,46,224,1202,7120,46366,329984,2551202, 21306880,191252686,1836652544,18793429202, 204154071040,2346705139006,28459289083904, 363156549211202,4864231397785600, 68237760828425326,1000569392347480064, 15306487540377673202] |