n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 7 |
4 | 20 |
5 | 67 |
6 | 222 |
7 | 758 |
8 | 2617 |
9 | 9189 |
10 | 32554 |
11 | 116494 |
12 | 420046 |
13 | 1525221 |
14 | 5571065 |
15 | 20457808 |
16 | 75476447 |
17 | 279636977 |
18 | 1039965746 |
19 | 3880891892 |
20 | 14527657602 |
21 | 54537434161 |
22 | 205270200229 |
23 | 774460385687 |
24 | 2928429307876 |
25 | 11095878177649 |
26 | 42122749335654 |
27 | 160192845018335 |
28 | 610224764470011 |
[1,1,2,7,20,67,222,758,2617,9189,32554,116494, 420046,1525221,5571065,20457808,75476447, 279636977,1039965746,3880891892,14527657602, 54537434161,205270200229,774460385687, 2928429307876,11095878177649,42122749335654, 160192845018335,610224764470011] |