n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 0 |
4 | 6 |
5 | 16 |
6 | 32 |
7 | 104 |
8 | 186 |
9 | 800 |
10 | 1700 |
11 | 4836 |
12 | 11186 |
13 | 29940 |
14 | 84388 |
15 | 208808 |
16 | 563364 |
17 | 1391664 |
18 | 3787510 |
19 | 9824684 |
20 | 25712276 |
21 | 66815444 |
22 | 173151378 |
23 | 457266220 |
24 | 1188536784 |
25 | 3113743272 |
26 | 8087358736 |
27 | 21152284376 |
28 | 55283003950 |
29 | 144314582896 |
30 | 376852311434 |
31 | 982507243820 |
[1,0,2,0,6,16,32,104,186,800,1700,4836,11186, 29940,84388,208808,563364,1391664,3787510,9824684, 25712276,66815444,173151378,457266220,1188536784, 3113743272,8087358736,21152284376,55283003950, 144314582896,376852311434,982507243820] |