n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 12 |
5 | 40 |
6 | 156 |
7 | 700 |
8 | 3520 |
9 | 19592 |
10 | 119992 |
11 | 801272 |
12 | 5792464 |
13 | 45071600 |
14 | 375615696 |
15 | 3338063600 |
16 | 31511918816 |
17 | 314913425280 |
18 | 3321357021600 |
19 | 36868596345056 |
20 | 429672869359360 |
21 | 5245439731918784 |
22 | 66941714022827072 |
23 | 891387254398818752 |
24 | 12363478873222765568 |
25 | 178331546692362644992 |
26 | 2671094825005048612224 |
[1,1,2,4,12,40,156,700,3520,19592,119992,801272, 5792464,45071600,375615696,3338063600,31511918816, 314913425280,3321357021600,36868596345056, 429672869359360,5245439731918784, 66941714022827072,891387254398818752, 12363478873222765568,178331546692362644992, 2671094825005048612224] |