n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 21 |
3 | 41 |
4 | 461 |
5 | 1281 |
6 | 10501 |
7 | 36121 |
8 | 246141 |
9 | 968561 |
10 | 5891381 |
11 | 25262601 |
12 | 143090221 |
13 | 648342241 |
14 | 3510146661 |
15 | 16476991481 |
16 | 86679924701 |
17 | 416219754321 |
18 | 2149818248341 |
19 | 10474213334761 |
20 | 53470578301581 |
21 | 262954844996801 |
[1,1,21,41,461,1281,10501,36121,246141,968561, 5891381,25262601,143090221,648342241,3510146661, 16476991481,86679924701,416219754321, 2149818248341,10474213334761,53470578301581, 262954844996801] |