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 | 1 |
| 2 | 11 |
| 3 | 121 |
| 4 | 1111 |
| 5 | 12221 |
| 6 | 134431 |
| 7 | 1234321 |
| 8 | 1478741 |
| 9 | 1600951 |
| 10 | 17610461 |
| 11 | 161696051 |
| 12 | 193715071 |
| 13 | 1634570971 |