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 | 11 |
| 2 | 311 |
| 3 | 5101 |
| 4 | 131101 |
| 5 | 2511001 |
| 6 | 37100101 |
| 7 | 51110011 |
| 8 | 59111011 |
| 9 | 731001001 |
| 10 | 931011101 |
| 11 | 971100001 |
| 12 | 1191110111 |
| 13 | 12910000001 |
| 14 | 13110000011 |
| 15 | 13710001001 |
| 16 | 15310011001 |
| 17 | 17310101101 |
| 18 | 19311000001 |
| 19 | 21311010101 |
| 20 | 21511010111 |
| 21 | 24711110111 |
| 22 | 25511111111 |
| 23 | 319100111111 |