n | a(n) |
---|---|
4 | 1 |
5 | 10 |
6 | 65 |
7 | 350 |
8 | 1701 |
9 | 7770 |
10 | 34105 |
11 | 145750 |
12 | 611501 |
13 | 2532530 |
14 | 10391745 |
15 | 42355950 |
16 | 171798901 |
17 | 694337290 |
18 | 2798806985 |
19 | 11259666950 |
20 | 45232115901 |
21 | 181509070050 |
22 | 727778623825 |
23 | 2916342574750 |
24 | 11681056634501 |
25 | 46771289738810 |
26 | 187226356946265 |
27 | 749329038535350 |
[1,10,65,350,1701,7770,34105,145750,611501, 2532530,10391745,42355950,171798901,694337290, 2798806985,11259666950,45232115901,181509070050, 727778623825,2916342574750,11681056634501, 46771289738810,187226356946265,749329038535350] |