n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 6 |
4 | 19 |
5 | 63 |
6 | 216 |
7 | 756 |
8 | 2684 |
9 | 9638 |
10 | 34930 |
11 | 127560 |
12 | 468837 |
13 | 1732702 |
14 | 6434322 |
15 | 23993874 |
16 | 89805691 |
17 | 337237337 |
18 | 1270123530 |
19 | 4796310672 |
20 | 18155586993 |
21 | 68874803609 |
22 | 261803388854 |
23 | 996971935098 |
24 | 3802944302442 |
25 | 14528816598358 |
[1,2,6,19,63,216,756,2684,9638,34930,127560, 468837,1732702,6434322,23993874,89805691, 337237337,1270123530,4796310672,18155586993, 68874803609,261803388854,996971935098, 3802944302442,14528816598358] |