n | a(n) |
---|---|
2 | 1 |
3 | 2 |
4 | 4 |
5 | 9 |
6 | 20 |
7 | 45 |
8 | 105 |
9 | 249 |
10 | 599 |
11 | 1463 |
12 | 3614 |
13 | 9016 |
14 | 22695 |
15 | 57564 |
16 | 146985 |
17 | 377555 |
18 | 974924 |
19 | 2529308 |
20 | 6589734 |
21 | 17234114 |
22 | 45228343 |
23 | 119069228 |
24 | 314368027 |
25 | 832193902 |
26 | 2208347917 |
27 | 5873364623 |
28 | 15653499416 |
29 | 41800070483 |
30 | 111821751649 |
[1,2,4,9,20,45,105,249,599,1463,3614,9016,22695, 57564,146985,377555,974924,2529308,6589734, 17234114,45228343,119069228,314368027,832193902, 2208347917,5873364623,15653499416,41800070483, 111821751649] |