n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 7 |
5 | 22 |
6 | 68 |
7 | 205 |
8 | 634 |
9 | 2011 |
10 | 6490 |
11 | 21178 |
12 | 69785 |
13 | 231940 |
14 | 776794 |
15 | 2618951 |
16 | 8881373 |
17 | 30274185 |
18 | 103673227 |
19 | 356500914 |
20 | 1230497234 |
21 | 4261633997 |
22 | 14805279769 |
23 | 51580807121 |
24 | 180173390369 |
25 | 630864082719 |
26 | 2213834486422 |
27 | 7784823272163 |
28 | 27427361186479 |
[1,1,1,2,7,22,68,205,634,2011,6490,21178,69785, 231940,776794,2618951,8881373,30274185,103673227, 356500914,1230497234,4261633997,14805279769, 51580807121,180173390369,630864082719, 2213834486422,7784823272163,27427361186479] |