n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 14 |
4 | 47 |
5 | 149 |
6 | 458 |
7 | 1373 |
8 | 4046 |
9 | 11765 |
10 | 33857 |
11 | 96611 |
12 | 273760 |
13 | 771164 |
14 | 2161352 |
15 | 6031104 |
16 | 16764719 |
17 | 46442640 |
18 | 128268379 |
19 | 353296944 |
20 | 970717966 |
21 | 2661204271 |
22 | 7280832780 |
23 | 19882745230 |
24 | 54203791062 |
25 | 147536291969 |
26 | 400991600305 |
[1,4,14,47,149,458,1373,4046,11765,33857,96611, 273760,771164,2161352,6031104,16764719,46442640, 128268379,353296944,970717966,2661204271, 7280832780,19882745230,54203791062,147536291969, 400991600305] |