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 | 121 |
| 2 | 10001 |
| 3 | 10201 |
| 4 | 36763 |
| 5 | 1226221 |
| 6 | 7673767 |
| 7 | 12467976421 |
| 8 | 1030507050301 |
| 9 | 1120237320211 |
| 10 | 1225559555221 |
| 11 | 1234469644321 |
| 12 | 1334459544331 |
| 13 | 100330272033001 |
| 14 | 100827848728001 |
| 15 | 101222252222101 |
| 16 | 103023070320301 |
| 17 | 121363494363121 |
| 18 | 134312696213431 |
| 19 | 10022212521222001 |