n | a(n) |
---|---|
2 | 0 |
3 | 2 |
4 | 12 |
5 | 52 |
6 | 205 |
7 | 786 |
8 | 2996 |
9 | 11432 |
10 | 43749 |
11 | 167950 |
12 | 646635 |
13 | 2496132 |
14 | 9657687 |
15 | 37442146 |
16 | 145422660 |
17 | 565722704 |
18 | 2203961413 |
19 | 8597496582 |
20 | 33578000591 |
21 | 131282408380 |
22 | 513791607399 |
23 | 2012616400058 |
24 | 7890371113927 |
25 | 30957699535752 |
26 | 121548660036275 |
[0,2,12,52,205,786,2996,11432,43749,167950,646635, 2496132,9657687,37442146,145422660,565722704, 2203961413,8597496582,33578000591,131282408380, 513791607399,2012616400058,7890371113927, 30957699535752,121548660036275] |