n | a(n) |
---|---|
1 | 21 |
2 | 441 |
3 | 1087 |
4 | 6459 |
5 | 21547 |
6 | 56651 |
7 | 235872 |
8 | 862146 |
9 | 2629798 |
10 | 9529570 |
11 | 34708948 |
12 | 114255562 |
13 | 396908066 |
14 | 1416972222 |
15 | 4828733870 |
16 | 16634895736 |
17 | 58487207221 |
18 | 201993811973 |
19 | 696619145912 |
20 | 2429011369708 |
21 | 8423471768055 |
22 | 29119549204363 |
[21,441,1087,6459,21547,56651,235872,862146, 2629798,9529570,34708948,114255562,396908066, 1416972222,4828733870,16634895736,58487207221, 201993811973,696619145912,2429011369708, 8423471768055,29119549204363] |