n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 3 |
3 | 14 |
4 | 57 |
5 | 229 |
6 | 916 |
7 | 7761 |
8 | 29567 |
9 | 117474 |
10 | 469113 |
11 | 3973641 |
12 | 15138352 |
13 | 60146777 |
14 | 240187355 |
15 | 2070207870 |
16 | 7733090689 |
17 | 30791909229 |
18 | 260408711716 |
19 | 991495872825 |
20 | 3942106110215 |
21 | 15739612088946 |
22 | 133333733918417 |
[0,1,3,14,57,229,916,7761,29567,117474,469113, 3973641,15138352,60146777,240187355,2070207870, 7733090689,30791909229,260408711716,991495872825, 3942106110215,15739612088946,133333733918417] |