n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 9 |
3 | 28 |
4 | 90 |
5 | 297 |
6 | 1001 |
7 | 3432 |
8 | 11933 |
9 | 41971 |
10 | 149017 |
11 | 533141 |
12 | 1919215 |
13 | 6942950 |
14 | 25215181 |
15 | 91858456 |
16 | 335449202 |
17 | 1227312350 |
18 | 4496994689 |
19 | 16496266812 |
20 | 60566602692 |
21 | 222524531559 |
22 | 817997639090 |
23 | 3008175954887 |
24 | 11066005530460 |
25 | 40717739034761 |
[1,3,9,28,90,297,1001,3432,11933,41971,149017, 533141,1919215,6942950,25215181,91858456, 335449202,1227312350,4496994689,16496266812, 60566602692,222524531559,817997639090, 3008175954887,11066005530460,40717739034761] |