n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 22 |
4 | 140 |
5 | 970 |
6 | 7196 |
7 | 56092 |
8 | 452064 |
9 | 3735700 |
10 | 31484244 |
11 | 269613896 |
12 | 2339571468 |
13 | 20529434520 |
14 | 181871459580 |
15 | 1624587752400 |
16 | 14617165101216 |
[1,4,22,140,970,7196,56092,452064,3735700, 31484244,269613896,2339571468,20529434520, 181871459580,1624587752400,14617165101216] |