n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 6 |
4 | 13 |
5 | 39 |
6 | 115 |
7 | 295 |
8 | 861 |
9 | 2403 |
10 | 7048 |
11 | 20377 |
12 | 60008 |
13 | 175978 |
14 | 519589 |
15 | 1532455 |
16 | 4531277 |
17 | 13395656 |
18 | 39639758 |
19 | 117301153 |
20 | 347248981 |
21 | 1028011708 |
22 | 3043852214 |
23 | 9012879842 |
24 | 26689014028 |
25 | 79033362580 |
26 | 234045889421 |
27 | 693101137571 |
28 | 2052569508948 |
[1,1,4,6,13,39,115,295,861,2403,7048,20377,60008, 175978,519589,1532455,4531277,13395656,39639758, 117301153,347248981,1028011708,3043852214, 9012879842,26689014028,79033362580,234045889421, 693101137571,2052569508948] |