n | a(n) |
---|---|
0 | 0 |
1 | 3 |
2 | 16 |
3 | 75 |
4 | 356 |
5 | 1770 |
6 | 9306 |
7 | 51821 |
8 | 305232 |
9 | 1897227 |
10 | 12411650 |
11 | 85234864 |
12 | 612903324 |
13 | 4604004691 |
14 | 36050248752 |
15 | 293659886235 |
16 | 2483993559376 |
17 | 21781908622738 |
18 | 197701336871190 |
19 | 1854695911048053 |
20 | 17960309481562600 |
21 | 179309794875495795 |
[0,3,16,75,356,1770,9306,51821,305232,1897227, 12411650,85234864,612903324,4604004691, 36050248752,293659886235,2483993559376, 21781908622738,197701336871190,1854695911048053, 17960309481562600,179309794875495795] |