n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 6 |
4 | 18 |
5 | 46 |
6 | 115 |
7 | 374 |
8 | 1204 |
9 | 3752 |
10 | 11300 |
11 | 34324 |
12 | 105124 |
13 | 322989 |
14 | 989692 |
15 | 3028484 |
16 | 9267328 |
17 | 28374898 |
18 | 86891022 |
19 | 266058106 |
20 | 814585879 |
21 | 2494006074 |
22 | 7636057864 |
23 | 23380074400 |
24 | 71584762200 |
25 | 219176102664 |
26 | 671066472872 |
27 | 2054652945289 |
[0,0,0,6,18,46,115,374,1204,3752,11300,34324, 105124,322989,989692,3028484,9267328,28374898, 86891022,266058106,814585879,2494006074, 7636057864,23380074400,71584762200,219176102664, 671066472872,2054652945289] |