n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 1 |
5 | 10 |
6 | 65 |
7 | 350 |
8 | 1700 |
9 | 7770 |
10 | 34095 |
11 | 145750 |
12 | 611435 |
13 | 2532530 |
14 | 10391395 |
15 | 42355940 |
16 | 171797200 |
17 | 694337290 |
18 | 2798799150 |
19 | 11259666950 |
20 | 45232081795 |
21 | 181509069700 |
22 | 727778478075 |
23 | 2916342574750 |
24 | 11681056021300 |
25 | 46771289738800 |
26 | 187226354413735 |
27 | 749329038527580 |
[0,0,0,1,10,65,350,1700,7770,34095,145750,611435, 2532530,10391395,42355940,171797200,694337290, 2798799150,11259666950,45232081795,181509069700, 727778478075,2916342574750,11681056021300, 46771289738800,187226354413735,749329038527580] |