n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 4 |
4 | 25 |
5 | 187 |
6 | 1772 |
7 | 17880 |
8 | 191967 |
9 | 2141232 |
10 | 24640989 |
11 | 290610414 |
12 | 3498042924 |
13 | 42831369777 |
14 | 532148952720 |
15 | 6695274478834 |
16 | 85166167050949 |
17 | 1093843440166718 |
18 | 14169564589464986 |
19 | 184957445502335682 |
20 | 2430876839834279341 |
21 | 32147041999684759275 |
22 | 427520786795342624432 |
[1,1,1,4,25,187,1772,17880,191967,2141232, 24640989,290610414,3498042924,42831369777, 532148952720,6695274478834,85166167050949, 1093843440166718,14169564589464986, 184957445502335682,2430876839834279341, 32147041999684759275,427520786795342624432] |