n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 3 |
4 | 1 |
5 | 30 |
6 | 90 |
7 | 630 |
8 | 1 |
9 | 22680 |
10 | 113400 |
11 | 1247400 |
12 | 1 |
13 | 97297200 |
14 | 681080400 |
15 | 10216206000 |
16 | 1 |
17 | 1389404016000 |
18 | 12504636144000 |
19 | 237588086736000 |
20 | 1 |
21 | 49893498214560000 |
22 | 548828480360160000 |
23 | 12623055048283680000 |
24 | 1 |
25 | 3786916514485104000000 |
26 | 49229914688306352000000 |
[1,1,1,3,1,30,90,630,1,22680,113400,1247400,1, 97297200,681080400,10216206000,1,1389404016000, 12504636144000,237588086736000,1, 49893498214560000,548828480360160000, 12623055048283680000,1,3786916514485104000000, 49229914688306352000000] |