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 | 3 |
| 3 | 49 |
| 4 | 87 |
| 5 | 130321 |
| 6 | 4753 |
| 7 | 7212549413161 |
| 8 | 285541 |
| 9 | 7890946561 |
| 10 | 834472284661 |
| 11 | 174913992535407978606601 |
| 12 | 19699251391 |
| 13 | 23205949656945057666311162427422570380321 |