n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 24 |
5 | 180 |
6 | 1432 |
7 | 14544 |
8 | 176064 |
9 | 2382800 |
10 | 36330272 |
11 | 618520384 |
12 | 11562021504 |
13 | 235623136320 |
14 | 5205288291712 |
15 | 123834383495424 |
16 | 3155999144761344 |
17 | 85799392788650240 |
18 | 2478387574846218752 |
[0,1,2,4,24,180,1432,14544,176064,2382800, 36330272,618520384,11562021504,235623136320, 5205288291712,123834383495424,3155999144761344, 85799392788650240,2478387574846218752] |