This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 11 |
| 3 | 101 |
| 4 | 181 |
| 5 | 1181 |
| 6 | 1811 |
| 7 | 18181 |
| 8 | 108881 |
| 9 | 110881 |
| 10 | 118081 |
| 11 | 120121 |
| 12 | 121021 |
| 13 | 121151 |
| 14 | 150151 |
| 15 | 151051 |
| 16 | 151121 |
| 17 | 180181 |
| 18 | 180811 |
| 19 | 181081 |
| 20 | 188011 |
| 21 | 188801 |
| 22 | 1008001 |
| 23 | 1022201 |
| 24 | 1028011 |
| 25 | 1055501 |
| 26 | 1058011 |
| 27 | 1082801 |
| 28 | 1085801 |
| 29 | 1088081 |