n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 17 |
4 | 86 |
5 | 674 |
6 | 5604 |
7 | 55236 |
8 | 579648 |
9 | 7302816 |
10 | 95738400 |
11 | 1391181120 |
12 | 21792119040 |
13 | 366215610240 |
14 | 6581045197440 |
15 | 126809720795520 |
16 | 2559529594782720 |
17 | 54828458042158080 |
18 | 1242024477363855360 |
19 | 29351942535941867520 |
20 | 729546143909048524800 |
[1,1,3,17,86,674,5604,55236,579648,7302816, 95738400,1391181120,21792119040,366215610240, 6581045197440,126809720795520,2559529594782720, 54828458042158080,1242024477363855360, 29351942535941867520,729546143909048524800] |