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 | 3001 |
| 5 | 21001 |
| 6 | 102001 |
| 7 | 2100001 |
| 8 | 30000001 |
| 9 | 200001001 |
| 10 | 2010000001 |
| 11 | 30000000001 |
| 12 | 110000000101 |
| 13 | 2000001000001 |
| 14 | 20000000100001 |
| 15 | 200000010000001 |
| 16 | 1100010000000001 |
| 17 | 20000001000000001 |
| 18 | 110000000000000101 |
| 19 | 2000000000000100001 |
| 20 | 20000000100000000001 |