n | a(n) |
---|---|
2 | 1 |
3 | 6 |
4 | 28 |
5 | 120 |
6 | 494 |
7 | 1988 |
8 | 7888 |
9 | 31008 |
10 | 121125 |
11 | 471086 |
12 | 1826660 |
13 | 7068360 |
14 | 27313650 |
15 | 105452700 |
16 | 406923360 |
17 | 1569869760 |
18 | 6056194410 |
19 | 23366193084 |
20 | 90173331960 |
21 | 348102883184 |
22 | 1344324544156 |
23 | 5193831553416 |
24 | 20075820280544 |
25 | 77637309982400 |
[1,6,28,120,494,1988,7888,31008,121125,471086, 1826660,7068360,27313650,105452700,406923360, 1569869760,6056194410,23366193084,90173331960, 348102883184,1344324544156,5193831553416, 20075820280544,77637309982400] |