n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 20 |
6 | 70 |
7 | 254 |
8 | 947 |
9 | 3604 |
10 | 13936 |
11 | 54574 |
12 | 215914 |
13 | 861454 |
14 | 3461208 |
15 | 13988932 |
16 | 56821743 |
17 | 231793334 |
18 | 949033702 |
19 | 3897956648 |
20 | 16053912116 |
21 | 66275614190 |
22 | 274168532480 |
23 | 1136192222288 |
24 | 4715741791756 |
25 | 19598263084654 |
[1,1,2,6,20,70,254,947,3604,13936,54574,215914, 861454,3461208,13988932,56821743,231793334, 949033702,3897956648,16053912116,66275614190, 274168532480,1136192222288,4715741791756, 19598263084654] |