n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 2 |
4 | 10 |
5 | 50 |
6 | 250 |
7 | 1442 |
8 | 9514 |
9 | 68882 |
10 | 539098 |
11 | 4546562 |
12 | 41123338 |
13 | 396400754 |
14 | 4050377146 |
15 | 43694283362 |
16 | 495985850602 |
17 | 5906224845266 |
18 | 73578420729754 |
19 | 956597103241922 |
20 | 12951012525806026 |
21 | 182233188537332018 |
22 | 2660301596873941882 |
23 | 40226477151229612322 |
[1,0,2,2,10,50,250,1442,9514,68882,539098,4546562, 41123338,396400754,4050377146,43694283362, 495985850602,5906224845266,73578420729754, 956597103241922,12951012525806026, 182233188537332018,2660301596873941882, 40226477151229612322] |