n | a(n) |
---|---|
1 | 1 |
2 | 7 |
3 | 21 |
4 | 60 |
5 | 167 |
6 | 466 |
7 | 1297 |
8 | 3613 |
9 | 10060 |
10 | 28012 |
11 | 77998 |
12 | 217180 |
13 | 604723 |
14 | 1683804 |
15 | 4688422 |
16 | 13054548 |
17 | 36349377 |
18 | 101212019 |
19 | 281817012 |
20 | 784697597 |
21 | 2184929553 |
22 | 6083766752 |
23 | 16939776315 |
24 | 47167492325 |
25 | 131334221349 |
26 | 365689945495 |
[1,7,21,60,167,466,1297,3613,10060,28012,77998, 217180,604723,1683804,4688422,13054548,36349377, 101212019,281817012,784697597,2184929553, 6083766752,16939776315,47167492325,131334221349, 365689945495] |