n | a(n) |
---|---|
0 | 2 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 5 |
5 | 14 |
6 | 42 |
7 | 128 |
8 | 384 |
9 | 1123 |
10 | 3204 |
11 | 8955 |
12 | 24629 |
13 | 66913 |
14 | 180127 |
15 | 481568 |
16 | 1280855 |
17 | 3393644 |
18 | 8965476 |
19 | 23633702 |
20 | 62197602 |
21 | 163483201 |
22 | 429300366 |
23 | 1126514817 |
24 | 2954438135 |
25 | 7745187919 |
26 | 20297902537 |
27 | 53182073798 |
28 | 139315427369 |
29 | 364898425658 |
30 | 955648284654 |
[2,1,1,2,5,14,42,128,384,1123,3204,8955,24629, 66913,180127,481568,1280855,3393644,8965476, 23633702,62197602,163483201,429300366,1126514817, 2954438135,7745187919,20297902537,53182073798, 139315427369,364898425658,955648284654] |