n | a(n) |
---|---|
2 | 1 |
3 | 3 |
4 | 9 |
5 | 26 |
6 | 75 |
7 | 214 |
8 | 612 |
9 | 1747 |
10 | 4995 |
11 | 14294 |
12 | 40967 |
13 | 117560 |
14 | 337830 |
15 | 972027 |
16 | 2800210 |
17 | 8075889 |
18 | 23315775 |
19 | 67380458 |
20 | 194901273 |
21 | 564239262 |
22 | 1634763697 |
23 | 4739866803 |
24 | 13752309730 |
25 | 39926751310 |
26 | 115988095896 |
27 | 337138003197 |
[1,3,9,26,75,214,612,1747,4995,14294,40967,117560, 337830,972027,2800210,8075889,23315775,67380458, 194901273,564239262,1634763697,4739866803, 13752309730,39926751310,115988095896,337138003197] |