n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 15 |
4 | 59 |
5 | 230 |
6 | 901 |
7 | 3522 |
8 | 13773 |
9 | 53847 |
10 | 210527 |
11 | 823087 |
12 | 3218002 |
13 | 12581319 |
14 | 49188823 |
15 | 192312112 |
16 | 751877137 |
17 | 2939592383 |
18 | 11492839729 |
19 | 44933224559 |
20 | 175674134309 |
21 | 686828104551 |
22 | 2685272063984 |
23 | 10498530869151 |
24 | 41045803846015 |
25 | 160475597429847 |
[1,1,4,15,59,230,901,3522,13773,53847,210527, 823087,3218002,12581319,49188823,192312112, 751877137,2939592383,11492839729,44933224559, 175674134309,686828104551,2685272063984, 10498530869151,41045803846015,160475597429847] |