n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 1 |
6 | 5 |
7 | 15 |
8 | 35 |
9 | 70 |
10 | 574 |
11 | 2674 |
12 | 9274 |
13 | 26599 |
14 | 305747 |
15 | 1944033 |
16 | 8995805 |
17 | 33757360 |
18 | 498851248 |
19 | 4017418768 |
20 | 23236611280 |
21 | 107709888805 |
22 | 1945409895065 |
23 | 18965460022971 |
24 | 131635127294783 |
25 | 726401013530416 |
26 | 15505381392117616 |
27 | 177447751441161616 |
[1,1,1,1,1,1,5,15,35,70,574,2674,9274,26599, 305747,1944033,8995805,33757360,498851248, 4017418768,23236611280,107709888805,1945409895065, 18965460022971,131635127294783,726401013530416, 15505381392117616,177447751441161616] |