n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 9 |
6 | 20 |
7 | 48 |
8 | 114 |
9 | 283 |
10 | 709 |
11 | 1806 |
12 | 4626 |
13 | 11940 |
14 | 30880 |
15 | 80055 |
16 | 207586 |
17 | 538330 |
18 | 1395080 |
19 | 3612756 |
20 | 9346541 |
21 | 24157618 |
22 | 62377353 |
23 | 160914843 |
24 | 414737061 |
25 | 1068032468 |
26 | 2748211066 |
27 | 7066320945 |
28 | 18156540077 |
29 | 46621728265 |
30 | 119639668421 |
[1,1,1,2,4,9,20,48,114,283,709,1806,4626,11940, 30880,80055,207586,538330,1395080,3612756,9346541, 24157618,62377353,160914843,414737061,1068032468, 2748211066,7066320945,18156540077,46621728265, 119639668421] |