n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 3 |
3 | 7 |
4 | 19 |
5 | 55 |
6 | 159 |
7 | 471 |
8 | 1403 |
9 | 4199 |
10 | 12583 |
11 | 37735 |
12 | 113187 |
13 | 339543 |
14 | 1018607 |
15 | 3055799 |
16 | 9167371 |
17 | 27502087 |
18 | 82506231 |
19 | 247518663 |
20 | 742555955 |
21 | 2227667831 |
22 | 6683003455 |
23 | 20049010327 |
24 | 60147030939 |
25 | 180441092775 |
26 | 541323278279 |
27 | 1623969834791 |
28 | 4871909504323 |
[0,1,3,7,19,55,159,471,1403,4199,12583,37735, 113187,339543,1018607,3055799,9167371,27502087, 82506231,247518663,742555955,2227667831, 6683003455,20049010327,60147030939,180441092775, 541323278279,1623969834791,4871909504323] |