n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 45 |
3 | 270 |
4 | 1377 |
5 | 6318 |
6 | 26973 |
7 | 109350 |
8 | 426465 |
9 | 1614006 |
10 | 5963949 |
11 | 21611934 |
12 | 77058945 |
13 | 271034910 |
14 | 942244893 |
15 | 3242852982 |
16 | 11063007297 |
17 | 37450647270 |
18 | 125911658925 |
19 | 420738651054 |
20 | 1398200544801 |
21 | 4623476115726 |
[1,6,45,270,1377,6318,26973,109350,426465,1614006, 5963949,21611934,77058945,271034910,942244893, 3242852982,11063007297,37450647270,125911658925, 420738651054,1398200544801,4623476115726] |