n | a(n) |
---|---|
1 | 2 |
2 | 32 |
3 | 294 |
4 | 2304 |
5 | 16810 |
6 | 117600 |
7 | 799694 |
8 | 5326848 |
9 | 34928082 |
10 | 226195360 |
11 | 1450199542 |
12 | 9220780800 |
13 | 58221203066 |
14 | 365440965344 |
15 | 2282085037470 |
16 | 14187697422336 |
17 | 87860208024994 |
18 | 542209573735200 |
19 | 3335797263902918 |
20 | 20465738163774720 |
21 | 125247216613782858 |
[2,32,294,2304,16810,117600,799694,5326848, 34928082,226195360,1450199542,9220780800, 58221203066,365440965344,2282085037470, 14187697422336,87860208024994,542209573735200, 3335797263902918,20465738163774720, 125247216613782858] |