n | a(n) |
---|---|
1 | 3 |
2 | 120 |
3 | 281 |
4 | 1318 |
5 | 5162 |
6 | 20979 |
7 | 87747 |
8 | 363807 |
9 | 1503951 |
10 | 6293212 |
11 | 26205966 |
12 | 109324860 |
13 | 456564651 |
14 | 1906061826 |
15 | 7958703070 |
16 | 33240668699 |
17 | 138822265649 |
18 | 579797632188 |
19 | 2421619456162 |
20 | 10114301541455 |
21 | 42244329291518 |
[3,120,281,1318,5162,20979,87747,363807,1503951, 6293212,26205966,109324860,456564651,1906061826, 7958703070,33240668699,138822265649,579797632188, 2421619456162,10114301541455,42244329291518] |