n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 3 |
6 | 15 |
7 | 57 |
8 | 167 |
9 | 423 |
10 | 1099 |
11 | 3391 |
12 | 11855 |
13 | 41149 |
14 | 134185 |
15 | 418859 |
16 | 1313861 |
17 | 4285349 |
18 | 14456605 |
19 | 49097477 |
20 | 164889821 |
21 | 548126215 |
22 | 1824046555 |
23 | 6131204373 |
24 | 20817947419 |
25 | 70988707243 |
26 | 241907381783 |
27 | 823235370195 |
28 | 2804366824235 |
[1,1,1,1,3,15,57,167,423,1099,3391,11855,41149, 134185,418859,1313861,4285349,14456605,49097477, 164889821,548126215,1824046555,6131204373, 20817947419,70988707243,241907381783,823235370195, 2804366824235] |