n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 3 |
4 | 12 |
5 | 45 |
6 | 171 |
7 | 651 |
8 | 2488 |
9 | 9540 |
10 | 36690 |
11 | 141482 |
12 | 546864 |
13 | 2118207 |
14 | 8219967 |
15 | 31952115 |
16 | 124389552 |
17 | 484908408 |
18 | 1892657934 |
19 | 7395597354 |
20 | 28928182440 |
21 | 113260606074 |
22 | 443827115886 |
23 | 1740592240638 |
24 | 6831289801872 |
25 | 26829201570600 |
[0,0,1,3,12,45,171,651,2488,9540,36690,141482, 546864,2118207,8219967,31952115,124389552, 484908408,1892657934,7395597354,28928182440, 113260606074,443827115886,1740592240638, 6831289801872,26829201570600] |