n | a(n) |
---|---|
-1 | 1 |
0 | 9 |
1 | 51 |
2 | 204 |
3 | 681 |
4 | 1956 |
5 | 5135 |
6 | 12360 |
7 | 28119 |
8 | 60572 |
9 | 125682 |
10 | 251040 |
11 | 487426 |
12 | 920568 |
13 | 1699611 |
14 | 3070508 |
15 | 5445510 |
16 | 9490116 |
17 | 16283793 |
18 | 27537708 |
19 | 45959775 |
20 | 75760640 |
21 | 123471327 |
22 | 199081632 |
23 | 317814988 |
24 | 502608456 |
25 | 787889775 |
26 | 1224834672 |
27 | 1889206080 |
28 | 2892264900 |
[1,9,51,204,681,1956,5135,12360,28119,60572, 125682,251040,487426,920568,1699611,3070508, 5445510,9490116,16283793,27537708,45959775, 75760640,123471327,199081632,317814988,502608456, 787889775,1224834672,1889206080,2892264900] |