n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 1 |
5 | 3 |
6 | 5 |
7 | 11 |
8 | 23 |
9 | 52 |
10 | 120 |
11 | 286 |
12 | 702 |
13 | 1779 |
14 | 4636 |
15 | 12398 |
16 | 33981 |
17 | 95303 |
18 | 273134 |
19 | 798957 |
20 | 2382777 |
21 | 7238273 |
22 | 22376763 |
23 | 70343548 |
24 | 224698356 |
25 | 728843771 |
26 | 2399172217 |
27 | 8010042859 |
28 | 27109839313 |
29 | 92966452913 |
30 | 322876110331 |
[0,0,1,1,3,5,11,23,52,120,286,702,1779,4636,12398, 33981,95303,273134,798957,2382777,7238273, 22376763,70343548,224698356,728843771,2399172217, 8010042859,27109839313,92966452913,322876110331] |