n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 1 |
4 | 9 |
5 | 108 |
6 | 2700 |
7 | 81000 |
8 | 14883750 |
9 | 347287500 |
10 | 9724050000 |
11 | 36756909000000 |
12 | 466996528845000000 |
13 | 6472571889791700000000 |
14 | 1082926002881049327000000000 |
15 | 13008107146607164515924000000000 |
[1,1,1,1,9,108,2700,81000,14883750,347287500, 9724050000,36756909000000,466996528845000000, 6472571889791700000000, 1082926002881049327000000000, 13008107146607164515924000000000] |