n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 17 |
6 | 57 |
7 | 196 |
8 | 723 |
9 | 2729 |
10 | 10638 |
11 | 42161 |
12 | 169912 |
13 | 692703 |
14 | 2853523 |
15 | 11852644 |
16 | 49592966 |
17 | 208800209 |
18 | 883970867 |
19 | 3760605627 |
20 | 16068272965 |
21 | 68925340187 |
22 | 296705390322 |
23 | 1281351319402 |
24 | 5549911448062 |
25 | 24103086681839 |
26 | 104938476264310 |
27 | 457920147387969 |
28 | 2002462084788769 |
[1,1,2,6,17,57,196,723,2729,10638,42161,169912, 692703,2853523,11852644,49592966,208800209, 883970867,3760605627,16068272965,68925340187, 296705390322,1281351319402,5549911448062, 24103086681839,104938476264310,457920147387969, 2002462084788769] |