n | a(n) |
---|---|
1 | 2 |
2 | 12 |
3 | 56 |
4 | 240 |
5 | 990 |
6 | 4004 |
7 | 16016 |
8 | 63648 |
9 | 251940 |
10 | 994840 |
11 | 3922512 |
12 | 15452320 |
13 | 60843510 |
14 | 239519700 |
15 | 942871200 |
16 | 3711935040 |
17 | 14615744220 |
18 | 57562286760 |
19 | 226760523600 |
20 | 893550621600 |
21 | 3522078700140 |
22 | 13887053160552 |
[2,12,56,240,990,4004,16016,63648,251940,994840, 3922512,15452320,60843510,239519700,942871200, 3711935040,14615744220,57562286760,226760523600, 893550621600,3522078700140,13887053160552] |