n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 11 |
3 | 21 |
4 | 131 |
5 | 341 |
6 | 1651 |
7 | 5061 |
8 | 21571 |
9 | 72181 |
10 | 287891 |
11 | 1009701 |
12 | 3888611 |
13 | 13985621 |
14 | 52871731 |
15 | 192727941 |
16 | 721445251 |
17 | 2648724661 |
18 | 9863177171 |
19 | 36350423781 |
20 | 134982195491 |
21 | 498486433301 |
22 | 1848308388211 |
23 | 6833172721221 |
[1,1,11,21,131,341,1651,5061,21571,72181,287891, 1009701,3888611,13985621,52871731,192727941, 721445251,2648724661,9863177171,36350423781, 134982195491,498486433301,1848308388211, 6833172721221] |