n | a(n) |
---|---|
2 | 1 |
3 | 3 |
4 | 20 |
5 | 35 |
6 | 126 |
7 | 231 |
8 | 3432 |
9 | 6435 |
10 | 24310 |
11 | 46189 |
12 | 352716 |
13 | 676039 |
14 | 2600150 |
15 | 5014575 |
16 | 155117520 |
17 | 300540195 |
18 | 1166803110 |
19 | 2268783825 |
20 | 17672631900 |
21 | 34461632205 |
22 | 134564468610 |
23 | 263012370465 |
24 | 4116715363800 |
25 | 8061900920775 |
26 | 31602651609438 |
27 | 61989816618513 |
28 | 486734856412028 |
[1,3,20,35,126,231,3432,6435,24310,46189,352716, 676039,2600150,5014575,155117520,300540195, 1166803110,2268783825,17672631900,34461632205, 134564468610,263012370465,4116715363800, 8061900920775,31602651609438,61989816618513, 486734856412028] |