n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 3 |
4 | 9 |
5 | 45 |
6 | 285 |
7 | 1995 |
8 | 15855 |
9 | 142695 |
10 | 1427895 |
11 | 15706845 |
12 | 188471745 |
13 | 2450132685 |
14 | 34301992725 |
15 | 514529890875 |
16 | 8232476226975 |
17 | 139952095858575 |
18 | 2519137759913775 |
19 | 47863617438361725 |
20 | 957272348112505425 |
21 | 20102719310362613925 |
22 | 442259824841726816925 |
23 | 10171975971359716789275 |
[0,0,1,3,9,45,285,1995,15855,142695,1427895, 15706845,188471745,2450132685,34301992725, 514529890875,8232476226975,139952095858575, 2519137759913775,47863617438361725, 957272348112505425,20102719310362613925, 442259824841726816925,10171975971359716789275] |