n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 6 |
4 | 21 |
5 | 73 |
6 | 239 |
7 | 738 |
8 | 2178 |
9 | 6220 |
10 | 17351 |
11 | 47595 |
12 | 128985 |
13 | 346492 |
14 | 924788 |
15 | 2456502 |
16 | 6502017 |
17 | 17164189 |
18 | 45219875 |
19 | 118954134 |
20 | 312559974 |
21 | 820560736 |
22 | 2152792187 |
23 | 5645155791 |
24 | 14797355181 |
25 | 38776269808 |
26 | 101590174424 |
27 | 266111693898 |
28 | 696979788213 |
29 | 1825297432705 |
[1,2,6,21,73,239,738,2178,6220,17351,47595,128985, 346492,924788,2456502,6502017,17164189,45219875, 118954134,312559974,820560736,2152792187, 5645155791,14797355181,38776269808,101590174424, 266111693898,696979788213,1825297432705] |