n | a(n) |
---|---|
2 | 1 |
3 | 4 |
4 | 13 |
5 | 44 |
6 | 148 |
7 | 498 |
8 | 1676 |
9 | 5640 |
10 | 18980 |
11 | 63872 |
12 | 214944 |
13 | 723336 |
14 | 2434192 |
15 | 8191616 |
16 | 27566672 |
17 | 92768192 |
18 | 312186304 |
19 | 1050578720 |
20 | 3535439040 |
21 | 11897565568 |
22 | 40038044736 |
23 | 134737229824 |
24 | 453421769728 |
25 | 1525868548224 |
26 | 5134898635008 |
27 | 17280115002368 |
28 | 58151561641216 |
[1,4,13,44,148,498,1676,5640,18980,63872,214944, 723336,2434192,8191616,27566672,92768192, 312186304,1050578720,3535439040,11897565568, 40038044736,134737229824,453421769728, 1525868548224,5134898635008,17280115002368, 58151561641216] |