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 | 323 |
| 5 | 117283 |
| 6 | 432091 |
| 7 | 4132384531 |
| 8 | 15516834659 |
| 9 | 15941429747 |
| 10 | 98953554491 |
| 11 | 3272831195051 |
| 12 | 7362974489179 |
| 13 | 26306805687881 |
| 14 | 33869035218491 |
| 15 | 280980898827691 |