n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 12 |
3 | 48 |
4 | 167 |
5 | 541 |
6 | 1692 |
7 | 5187 |
8 | 15700 |
9 | 47030 |
10 | 139986 |
11 | 415385 |
12 | 1230417 |
13 | 3638657 |
14 | 10744058 |
15 | 31705658 |
16 | 93563017 |
17 | 276079102 |
18 | 814408697 |
19 | 2402076923 |
20 | 7085491321 |
21 | 20902994644 |
22 | 61668276920 |
23 | 181926014930 |
24 | 536710980085 |
25 | 1583529043750 |
26 | 4672393755494 |
27 | 13786612213841 |
[0,2,12,48,167,541,1692,5187,15700,47030,139986, 415385,1230417,3638657,10744058,31705658,93563017, 276079102,814408697,2402076923,7085491321, 20902994644,61668276920,181926014930,536710980085, 1583529043750,4672393755494,13786612213841] |