n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 4 |
4 | 9 |
5 | 21 |
6 | 55 |
7 | 151 |
8 | 447 |
9 | 1389 |
10 | 4502 |
11 | 15046 |
12 | 51505 |
13 | 179463 |
14 | 634086 |
15 | 2265014 |
16 | 8163125 |
17 | 29637903 |
18 | 108282989 |
19 | 397761507 |
20 | 1468063369 |
21 | 5441174511 |
22 | 20242989728 |
23 | 75566702558 |
24 | 282959337159 |
25 | 1062523000005 |
26 | 4000108867555 |
27 | 15095081362907 |
28 | 57088782570433 |
[1,2,4,9,21,55,151,447,1389,4502,15046,51505, 179463,634086,2265014,8163125,29637903,108282989, 397761507,1468063369,5441174511,20242989728, 75566702558,282959337159,1062523000005, 4000108867555,15095081362907,57088782570433] |