n | a(n) |
---|---|
3 | 1 |
4 | 2 |
5 | 6 |
6 | 25 |
7 | 107 |
8 | 509 |
9 | 2468 |
10 | 12258 |
11 | 61797 |
12 | 315830 |
13 | 1630770 |
14 | 8498303 |
15 | 44629855 |
16 | 235974495 |
17 | 1255105304 |
18 | 6710883952 |
19 | 36050676617 |
20 | 194478962422 |
21 | 1053120661726 |
22 | 5722375202661 |
23 | 31191334491891 |
24 | 170504130213135 |
25 | 934495666529380 |
26 | 5134182220623958 |
27 | 28270742653671621 |
[1,2,6,25,107,509,2468,12258,61797,315830,1630770, 8498303,44629855,235974495,1255105304,6710883952, 36050676617,194478962422,1053120661726, 5722375202661,31191334491891,170504130213135, 934495666529380,5134182220623958, 28270742653671621] |