n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 3 |
4 | 9 |
5 | 21 |
6 | 68 |
7 | 208 |
8 | 730 |
9 | 2542 |
10 | 9287 |
11 | 34053 |
12 | 127112 |
13 | 476849 |
14 | 1803636 |
15 | 6851960 |
16 | 26157362 |
17 | 100211446 |
18 | 385239872 |
19 | 1485232325 |
20 | 5741327939 |
21 | 22246061118 |
22 | 86383655207 |
23 | 336093789246 |
24 | 1309999171971 |
25 | 5114453234510 |
26 | 19998176771431 |
27 | 78306018629550 |
28 | 307022197845116 |
[1,2,3,9,21,68,208,730,2542,9287,34053,127112, 476849,1803636,6851960,26157362,100211446, 385239872,1485232325,5741327939,22246061118, 86383655207,336093789246,1309999171971, 5114453234510,19998176771431,78306018629550, 307022197845116] |