n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 5 |
5 | 21 |
6 | 78 |
7 | 274 |
8 | 927 |
9 | 3061 |
10 | 9933 |
11 | 31824 |
12 | 100972 |
13 | 317942 |
14 | 995088 |
15 | 3099105 |
16 | 9612735 |
17 | 29715525 |
18 | 91595391 |
19 | 281643480 |
20 | 864189486 |
21 | 2646805668 |
22 | 8093543439 |
23 | 24713953515 |
24 | 75370741506 |
25 | 229604257846 |
26 | 698754428388 |
27 | 2124616182139 |
[0,0,0,1,5,21,78,274,927,3061,9933,31824,100972, 317942,995088,3099105,9612735,29715525,91595391, 281643480,864189486,2646805668,8093543439, 24713953515,75370741506,229604257846,698754428388, 2124616182139] |