n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 2 |
5 | 4 |
6 | 9 |
7 | 23 |
8 | 62 |
9 | 167 |
10 | 461 |
11 | 1309 |
12 | 3784 |
13 | 11018 |
14 | 32431 |
15 | 96294 |
16 | 288246 |
17 | 868107 |
18 | 2629499 |
19 | 8005166 |
20 | 24482202 |
21 | 75177313 |
22 | 231697259 |
23 | 716488213 |
24 | 2222381516 |
25 | 6912569477 |
26 | 21556270329 |
27 | 67380727837 |
28 | 211080434346 |
[1,1,1,2,4,9,23,62,167,461,1309,3784,11018,32431, 96294,288246,868107,2629499,8005166,24482202, 75177313,231697259,716488213,2222381516, 6912569477,21556270329,67380727837,211080434346] |