n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 6 |
3 | 21 |
4 | 71 |
5 | 251 |
6 | 882 |
7 | 3088 |
8 | 10829 |
9 | 37975 |
10 | 133146 |
11 | 466852 |
12 | 1636944 |
13 | 5739647 |
14 | 20125051 |
15 | 70564951 |
16 | 247423522 |
17 | 867546829 |
18 | 3041899638 |
19 | 10665883415 |
20 | 37398034921 |
21 | 131129599227 |
22 | 459782762029 |
23 | 1612146986543 |
24 | 5652708454881 |
25 | 19820223058176 |
26 | 69496108849357 |
[1,1,6,21,71,251,882,3088,10829,37975,133146, 466852,1636944,5739647,20125051,70564951, 247423522,867546829,3041899638,10665883415, 37398034921,131129599227,459782762029, 1612146986543,5652708454881,19820223058176, 69496108849357] |