n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 30 |
4 | 245 |
5 | 2256 |
6 | 21849 |
7 | 220655 |
8 | 2294241 |
9 | 24402721 |
10 | 264251525 |
11 | 2903503779 |
12 | 32289673568 |
13 | 362755014742 |
14 | 4110792367801 |
15 | 46933876797456 |
16 | 539362815736466 |
17 | 6234031681945681 |
18 | 72421584940086375 |
19 | 845164178044504188 |
20 | 9903469546224045896 |
21 | 116475680442085941037 |
[1,1,4,30,245,2256,21849,220655,2294241,24402721, 264251525,2903503779,32289673568,362755014742, 4110792367801,46933876797456,539362815736466, 6234031681945681,72421584940086375, 845164178044504188,9903469546224045896, 116475680442085941037] |