n | a(n) |
---|---|
1 | 9 |
2 | 21 |
3 | 45 |
4 | 105 |
5 | 273 |
6 | 765 |
7 | 2229 |
8 | 6609 |
9 | 19737 |
10 | 59109 |
11 | 177213 |
12 | 531513 |
13 | 1594401 |
14 | 4783053 |
15 | 14348997 |
16 | 43046817 |
17 | 129140265 |
18 | 387420597 |
19 | 1162261581 |
20 | 3486784521 |
21 | 10460353329 |
22 | 31381059741 |
23 | 94143178965 |
24 | 282429536625 |
25 | 847288609593 |
[9,21,45,105,273,765,2229,6609,19737,59109,177213, 531513,1594401,4783053,14348997,43046817, 129140265,387420597,1162261581,3486784521, 10460353329,31381059741,94143178965,282429536625, 847288609593] |