n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 7 |
4 | 21 |
5 | 53 |
6 | 159 |
7 | 419 |
8 | 1257 |
9 | 3401 |
10 | 10203 |
11 | 28095 |
12 | 84285 |
13 | 235005 |
14 | 705015 |
15 | 1984155 |
16 | 5952465 |
17 | 16873745 |
18 | 50621235 |
19 | 144327287 |
20 | 432981861 |
21 | 1240296773 |
22 | 3720890319 |
23 | 10700364691 |
24 | 32101094073 |
25 | 92619680089 |
26 | 277859040267 |
27 | 803956981807 |
28 | 2411870945421 |
29 | 6995553520653 |
30 | 20986660561959 |
31 | 61001041404555 |
[1,1,3,7,21,53,159,419,1257,3401,10203,28095, 84285,235005,705015,1984155,5952465,16873745, 50621235,144327287,432981861,1240296773, 3720890319,10700364691,32101094073,92619680089, 277859040267,803956981807,2411870945421, 6995553520653,20986660561959,61001041404555] |