n | a(n) |
---|---|
2 | 1 |
3 | 6 |
4 | 28 |
5 | 120 |
6 | 495 |
7 | 2002 |
8 | 8008 |
9 | 31824 |
10 | 125970 |
11 | 497420 |
12 | 1961256 |
13 | 7726160 |
14 | 30421755 |
15 | 119759850 |
16 | 471435600 |
17 | 1855967520 |
18 | 7307872110 |
19 | 28781143380 |
20 | 113380261800 |
21 | 446775310800 |
22 | 1761039350070 |
23 | 6943526580276 |
24 | 27385657281648 |
25 | 108043253365600 |
[1,6,28,120,495,2002,8008,31824,125970,497420, 1961256,7726160,30421755,119759850,471435600, 1855967520,7307872110,28781143380,113380261800, 446775310800,1761039350070,6943526580276, 27385657281648,108043253365600] |