n | a(n) |
---|---|
3 | 1 |
4 | 3 |
5 | 9 |
6 | 31 |
7 | 102 |
8 | 328 |
9 | 1035 |
10 | 3217 |
11 | 9880 |
12 | 30062 |
13 | 90803 |
14 | 272697 |
15 | 815228 |
16 | 2428298 |
17 | 7212179 |
18 | 21370921 |
19 | 63207913 |
20 | 186668355 |
21 | 550617011 |
22 | 1622604097 |
23 | 4777983482 |
24 | 14060981252 |
25 | 41360234037 |
26 | 121616984851 |
27 | 357510486913 |
28 | 1050750138523 |
[1,3,9,31,102,328,1035,3217,9880,30062,90803, 272697,815228,2428298,7212179,21370921,63207913, 186668355,550617011,1622604097,4777983482, 14060981252,41360234037,121616984851,357510486913, 1050750138523] |