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 | 13 |
| 2 | 1512 |
| 3 | 1520 |
| 4 | 1521 |
| 5 | 12016 |
| 6 | 12035 |
| 7 | 226130351 |
| 8 | 209210612202 |
| 9 | 209210612212 |
| 10 | 209210612220 |
| 11 | 209210612221 |
| 12 | 13030323000581525 |