n | a(n) |
---|---|
4 | 3 |
5 | 18 |
6 | 89 |
7 | 405 |
8 | 1701 |
9 | 6801 |
10 | 26244 |
11 | 98415 |
12 | 360846 |
13 | 1299078 |
14 | 4605822 |
15 | 16120350 |
16 | 55801305 |
17 | 191318760 |
18 | 650483703 |
19 | 2195382771 |
20 | 7360989291 |
21 | 24536630727 |
22 | 81358302690 |
23 | 268482398877 |
24 | 882156452724 |
25 | 2887057484028 |
26 | 9414317882700 |
27 | 30596533116588 |
28 | 99132767304831 |
[3,18,89,405,1701,6801,26244,98415,360846,1299078, 4605822,16120350,55801305,191318760,650483703, 2195382771,7360989291,24536630727,81358302690, 268482398877,882156452724,2887057484028, 9414317882700,30596533116588,99132767304831] |