n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 6 |
4 | 20 |
5 | 67 |
6 | 222 |
7 | 728 |
8 | 2368 |
9 | 7653 |
10 | 24602 |
11 | 78730 |
12 | 250956 |
13 | 797159 |
14 | 2524342 |
15 | 7971612 |
16 | 25110584 |
17 | 78918985 |
18 | 247518642 |
19 | 774840974 |
20 | 2421378052 |
21 | 7554699531 |
22 | 23535794702 |
23 | 73222472416 |
24 | 227512682160 |
25 | 706073841197 |
26 | 2188828907722 |
27 | 6778308875538 |
28 | 20970393083708 |
29 | 64817578622383 |
[1,2,6,20,67,222,728,2368,7653,24602,78730,250956, 797159,2524342,7971612,25110584,78918985, 247518642,774840974,2421378052,7554699531, 23535794702,73222472416,227512682160,706073841197, 2188828907722,6778308875538,20970393083708, 64817578622383] |