n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 21 |
5 | 347 |
6 | 2919 |
7 | 17050 |
8 | 78815 |
9 | 309075 |
10 | 1072617 |
11 | 3386970 |
12 | 9921030 |
13 | 27338000 |
14 | 71614370 |
15 | 179788174 |
16 | 435311905 |
17 | 1021684125 |
18 | 2333955085 |
19 | 5207067714 |
20 | 11377225161 |
21 | 24403026561 |
22 | 51484962205 |
23 | 107024887620 |
24 | 219528748908 |
25 | 444886466640 |
26 | 891735024852 |
27 | 1769575953980 |
[0,0,0,0,21,347,2919,17050,78815,309075,1072617, 3386970,9921030,27338000,71614370,179788174, 435311905,1021684125,2333955085,5207067714, 11377225161,24403026561,51484962205,107024887620, 219528748908,444886466640,891735024852, 1769575953980] |