n | a(n) |
---|---|
6 | 1 |
7 | 0 |
8 | 4 |
9 | 6 |
10 | 24 |
11 | 66 |
12 | 214 |
13 | 676 |
14 | 2209 |
15 | 7296 |
16 | 24460 |
17 | 82926 |
18 | 284068 |
19 | 981882 |
20 | 3421318 |
21 | 12007554 |
22 | 42416488 |
23 | 150718770 |
24 | 538421590 |
25 | 1932856590 |
26 | 6969847486 |
27 | 25237057110 |
28 | 91729488354 |
29 | 334589415276 |
30 | 1224445617889 |
31 | 4494622119424 |
[1,0,4,6,24,66,214,676,2209,7296,24460,82926, 284068,981882,3421318,12007554,42416488,150718770, 538421590,1932856590,6969847486,25237057110, 91729488354,334589415276,1224445617889, 4494622119424] |