n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 14 |
3 | 46 |
4 | 146 |
5 | 454 |
6 | 1394 |
7 | 4246 |
8 | 12866 |
9 | 38854 |
10 | 117074 |
11 | 352246 |
12 | 1058786 |
13 | 3180454 |
14 | 9549554 |
15 | 28665046 |
16 | 86027906 |
17 | 258149254 |
18 | 774578834 |
19 | 2323998646 |
20 | 6972520226 |
21 | 20918609254 |
22 | 62757924914 |
23 | 188277969046 |
24 | 564842295746 |
25 | 1694543664454 |
26 | 5083664547794 |
27 | 15251060752246 |
[1,4,14,46,146,454,1394,4246,12866,38854,117074, 352246,1058786,3180454,9549554,28665046,86027906, 258149254,774578834,2323998646,6972520226, 20918609254,62757924914,188277969046,564842295746, 1694543664454,5083664547794,15251060752246] |