n | a(n) |
---|---|
2 | 0 |
3 | 1 |
4 | 6 |
5 | 24 |
6 | 86 |
7 | 307 |
8 | 1143 |
9 | 4513 |
10 | 18956 |
11 | 84546 |
12 | 399218 |
13 | 1989792 |
14 | 10439521 |
15 | 57504306 |
16 | 331747730 |
17 | 1999924893 |
18 | 12571830681 |
19 | 82245682149 |
20 | 558951842996 |
21 | 3939679356783 |
22 | 28754596249395 |
23 | 217019729585609 |
24 | 1691485555633721 |
25 | 13598390501982510 |
26 | 112633410446366669 |
[0,1,6,24,86,307,1143,4513,18956,84546,399218, 1989792,10439521,57504306,331747730,1999924893, 12571830681,82245682149,558951842996, 3939679356783,28754596249395,217019729585609, 1691485555633721,13598390501982510, 112633410446366669] |