n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 8 |
3 | 57 |
4 | 400 |
5 | 2801 |
6 | 19608 |
7 | 137257 |
8 | 960800 |
9 | 6725601 |
10 | 47079208 |
11 | 329554457 |
12 | 2306881200 |
13 | 16148168401 |
14 | 113037178808 |
15 | 791260251657 |
16 | 5538821761600 |
17 | 38771752331201 |
18 | 271402266318408 |
19 | 1899815864228857 |
20 | 13298711049602000 |
[0,1,8,57,400,2801,19608,137257,960800,6725601, 47079208,329554457,2306881200,16148168401, 113037178808,791260251657,5538821761600, 38771752331201,271402266318408,1899815864228857, 13298711049602000] |