n | a(n) |
---|---|
1 | 3 |
2 | 6 |
3 | 21 |
4 | 78 |
5 | 291 |
6 | 1086 |
7 | 4053 |
8 | 15126 |
9 | 56451 |
10 | 210678 |
11 | 786261 |
12 | 2934366 |
13 | 10951203 |
14 | 40870446 |
15 | 152530581 |
16 | 569251878 |
17 | 2124476931 |
18 | 7928655846 |
19 | 29590146453 |
20 | 110431929966 |
21 | 412137573411 |
22 | 1538118363678 |
23 | 5740335881301 |
24 | 21423225161526 |
25 | 79952564764803 |
26 | 298387033897686 |
[3,6,21,78,291,1086,4053,15126,56451,210678, 786261,2934366,10951203,40870446,152530581, 569251878,2124476931,7928655846,29590146453, 110431929966,412137573411,1538118363678, 5740335881301,21423225161526,79952564764803, 298387033897686] |