n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 9 |
3 | 26 |
4 | 76 |
5 | 221 |
6 | 644 |
7 | 1875 |
8 | 5461 |
9 | 15903 |
10 | 46314 |
11 | 134876 |
12 | 392791 |
13 | 1143896 |
14 | 3331289 |
15 | 9701475 |
16 | 28252921 |
17 | 82278978 |
18 | 239615244 |
19 | 697814501 |
20 | 2032195756 |
21 | 5918219771 |
22 | 17235212309 |
23 | 50192888175 |
24 | 146173193506 |
25 | 425689839228 |
[1,3,9,26,76,221,644,1875,5461,15903,46314,134876, 392791,1143896,3331289,9701475,28252921,82278978, 239615244,697814501,2032195756,5918219771, 17235212309,50192888175,146173193506,425689839228] |