n | a(n) |
---|---|
1 | 4 |
2 | 6 |
3 | 18 |
4 | 37 |
5 | 80 |
6 | 286 |
7 | 916 |
8 | 2532 |
9 | 7477 |
10 | 24285 |
11 | 76820 |
12 | 235117 |
13 | 731307 |
14 | 2316410 |
15 | 7294592 |
16 | 22810317 |
17 | 71569571 |
18 | 225378484 |
19 | 708826544 |
20 | 2225946457 |
21 | 6995090976 |
22 | 21998860077 |
23 | 69164809009 |
24 | 217385283885 |
25 | 683342646350 |
26 | 2148402980261 |
[4,6,18,37,80,286,916,2532,7477,24285,76820, 235117,731307,2316410,7294592,22810317,71569571, 225378484,708826544,2225946457,6995090976, 21998860077,69164809009,217385283885,683342646350, 2148402980261] |