n | a(n) |
---|---|
1 | 1 |
2 | 3 |
3 | 9 |
4 | 31 |
5 | 109 |
6 | 421 |
7 | 1585 |
8 | 5454 |
9 | 20681 |
10 | 80983 |
11 | 311221 |
12 | 1168531 |
13 | 4505761 |
14 | 17907735 |
15 | 69240865 |
16 | 272109736 |
17 | 1078430833 |
18 | 4147985381 |
19 | 16383884581 |
20 | 64335012378 |
21 | 234179431201 |
22 | 929947274509 |
23 | 3651532869601 |
24 | 14453209093051 |
25 | 56596999501225 |
[1,3,9,31,109,421,1585,5454,20681,80983,311221, 1168531,4505761,17907735,69240865,272109736, 1078430833,4147985381,16383884581,64335012378, 234179431201,929947274509,3651532869601, 14453209093051,56596999501225] |