n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 20 |
3 | 201 |
4 | 1360 |
5 | 7001 |
6 | 29364 |
7 | 104881 |
8 | 329024 |
9 | 927441 |
10 | 2390004 |
11 | 5707449 |
12 | 12767184 |
13 | 26986089 |
14 | 54284244 |
15 | 104535009 |
16 | 193664256 |
17 | 346615329 |
18 | 601446996 |
19 | 1014889769 |
20 | 1669752016 |
21 | 2684641785 |
22 | 4226553716 |
23 | 6526963345 |
24 | 9902174016 |
25 | 14778775025 |
26 | 21725194036 |
27 | 31490462745 |
[0,1,20,201,1360,7001,29364,104881,329024,927441, 2390004,5707449,12767184,26986089,54284244, 104535009,193664256,346615329,601446996, 1014889769,1669752016,2684641785,4226553716, 6526963345,9902174016,14778775025,21725194036, 31490462745] |