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) |
|---|---|
| 0 | 1 |
| 1 | 112 |
| 2 | 11223 |
| 3 | 1122334 |
| 4 | 112233445 |
| 5 | 11223344556 |
| 6 | 1122334455667 |
| 7 | 112233445566778 |
| 8 | 11223344556677889 |
| 9 | 1122334455667789000 |
| 10 | 112233445566778900111 |
| 11 | 11223344556677890011222 |
| 12 | 1122334455667789001122333 |
| 13 | 112233445566778900112233444 |
| 14 | 11223344556677890011223344555 |
| 15 | 1122334455667789001122334455666 |