n | a(n) |
---|---|
1 | 1 |
2 | 5 |
3 | 20 |
4 | 87 |
5 | 358 |
6 | 1533 |
7 | 6445 |
8 | 27555 |
9 | 117529 |
10 | 503001 |
11 | 2167209 |
12 | 9289047 |
13 | 40320051 |
14 | 173069913 |
15 | 755481768 |
16 | 3247042719 |
17 | 14236984102 |
18 | 61259521341 |
19 | 269560841080 |
20 | 1161017915091 |
21 | 5123885956516 |
22 | 22087793150253 |
23 | 97719510829418 |
[1,5,20,87,358,1533,6445,27555,117529,503001, 2167209,9289047,40320051,173069913,755481768, 3247042719,14236984102,61259521341,269560841080, 1161017915091,5123885956516,22087793150253, 97719510829418] |