n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 12 |
4 | 38 |
5 | 125 |
6 | 414 |
7 | 1369 |
8 | 4522 |
9 | 14934 |
10 | 49322 |
11 | 162899 |
12 | 538020 |
13 | 1776961 |
14 | 5868904 |
15 | 19383672 |
16 | 64019918 |
17 | 211443425 |
18 | 698350194 |
19 | 2306494009 |
20 | 7617832222 |
21 | 25159990674 |
22 | 83097804242 |
23 | 274453403399 |
24 | 906458014440 |
[1,4,12,38,125,414,1369,4522,14934,49322,162899, 538020,1776961,5868904,19383672,64019918, 211443425,698350194,2306494009,7617832222, 25159990674,83097804242,274453403399,906458014440] |