n | a(n) |
---|---|
1 | 0 |
2 | 2 |
3 | 12 |
4 | 60 |
5 | 231 |
6 | 758 |
7 | 2194 |
8 | 5756 |
9 | 13931 |
10 | 31538 |
11 | 67479 |
12 | 137551 |
13 | 268842 |
14 | 506410 |
15 | 923248 |
16 | 1634836 |
17 | 2820046 |
18 | 4750704 |
19 | 7832809 |
20 | 12663272 |
21 | 20107116 |
22 | 31401357 |
23 | 48293446 |
24 | 73224025 |
25 | 109566145 |
26 | 161935895 |
27 | 236592736 |
28 | 341951846 |
29 | 489235520 |
[0,2,12,60,231,758,2194,5756,13931,31538,67479, 137551,268842,506410,923248,1634836,2820046, 4750704,7832809,12663272,20107116,31401357, 48293446,73224025,109566145,161935895,236592736, 341951846,489235520] |