n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 6 |
3 | 27 |
4 | 113 |
5 | 464 |
6 | 1896 |
7 | 7738 |
8 | 31571 |
9 | 128800 |
10 | 525455 |
11 | 2143647 |
12 | 8745216 |
13 | 35676948 |
14 | 145547524 |
15 | 593775045 |
16 | 2422362078 |
17 | 9882257735 |
18 | 40315615409 |
19 | 164471408184 |
20 | 670976837020 |
21 | 2737314167774 |
22 | 11167134898975 |
23 | 45557394660800 |
24 | 185855747875875 |
25 | 758216295635151 |
[0,1,6,27,113,464,1896,7738,31571,128800,525455, 2143647,8745216,35676948,145547524,593775045, 2422362078,9882257735,40315615409,164471408184, 670976837020,2737314167774,11167134898975, 45557394660800,185855747875875,758216295635151] |