n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 2 |
6 | 4 |
7 | 14 |
8 | 37 |
9 | 105 |
10 | 309 |
11 | 939 |
12 | 2903 |
13 | 8865 |
14 | 28163 |
15 | 90648 |
16 | 297615 |
17 | 989077 |
18 | 3320885 |
19 | 11280835 |
20 | 38583017 |
21 | 133018026 |
22 | 461630411 |
23 | 1612842357 |
24 | 5667628973 |
25 | 20019876401 |
26 | 71078302590 |
27 | 253504107762 |
28 | 908014000543 |
29 | 3265037780657 |
[1,1,1,1,2,4,14,37,105,309,939,2903,8865,28163, 90648,297615,989077,3320885,11280835,38583017, 133018026,461630411,1612842357,5667628973, 20019876401,71078302590,253504107762,908014000543, 3265037780657] |