n | a(n) |
---|---|
0 | 1 |
1 | 9 |
2 | 50 |
3 | 294 |
4 | 1944 |
5 | 14520 |
6 | 121680 |
7 | 1134000 |
8 | 11652480 |
9 | 130999680 |
10 | 1600300800 |
11 | 21115987200 |
12 | 299376000000 |
13 | 4539498163200 |
14 | 73316942899200 |
15 | 1256675067648000 |
16 | 22784918188032000 |
17 | 435717099417600000 |
[1,9,50,294,1944,14520,121680,1134000,11652480, 130999680,1600300800,21115987200,299376000000, 4539498163200,73316942899200,1256675067648000, 22784918188032000,435717099417600000] |