n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 9 |
3 | 28 |
4 | 93 |
5 | 333 |
6 | 1272 |
7 | 5085 |
8 | 20925 |
9 | 87735 |
10 | 372879 |
11 | 1602450 |
12 | 6953824 |
13 | 30438138 |
14 | 134255403 |
15 | 596154495 |
16 | 2662813341 |
17 | 11955684591 |
18 | 53927330037 |
19 | 244250703252 |
20 | 1110401393067 |
21 | 5065143385647 |
22 | 23176155530394 |
23 | 106344639962973 |
[1,3,9,28,93,333,1272,5085,20925,87735,372879, 1602450,6953824,30438138,134255403,596154495, 2662813341,11955684591,53927330037,244250703252, 1110401393067,5065143385647,23176155530394, 106344639962973] |