n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 1 |
3 | 6 |
4 | 39 |
5 | 390 |
6 | 4815 |
7 | 73080 |
8 | 1304415 |
9 | 26847450 |
10 | 625528575 |
11 | 16279193700 |
12 | 468022452975 |
13 | 14731683916950 |
14 | 503880434632575 |
15 | 18609309606888000 |
16 | 738057377647965375 |
17 | 31286068076704691250 |
18 | 1411602439003747365375 |
19 | 67543694966494692445500 |
20 | 3416288904242387117319375 |
[0,1,1,6,39,390,4815,73080,1304415,26847450, 625528575,16279193700,468022452975,14731683916950, 503880434632575,18609309606888000, 738057377647965375,31286068076704691250, 1411602439003747365375,67543694966494692445500, 3416288904242387117319375] |