n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 9 |
5 | 28 |
6 | 66 |
7 | 153 |
8 | 433 |
9 | 1352 |
10 | 4104 |
11 | 12188 |
12 | 37506 |
13 | 124155 |
14 | 422307 |
15 | 1437135 |
16 | 5058945 |
17 | 18255295 |
18 | 65336580 |
19 | 232233723 |
20 | 832793160 |
21 | 3003712770 |
22 | 10788778026 |
23 | 38582183151 |
24 | 137946936834 |
25 | 493981065171 |
26 | 1770660835057 |
27 | 6347845365236 |
[1,1,1,2,9,28,66,153,433,1352,4104,12188,37506, 124155,422307,1437135,5058945,18255295,65336580, 232233723,832793160,3003712770,10788778026, 38582183151,137946936834,493981065171, 1770660835057,6347845365236] |