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 | 11 |
| 2 | 101 |
| 3 | 300491 |
| 4 | 61820577884902511 |
| 5 | 348769459612079711 |
| 6 | 427950243745391951 |
| 7 | 668482766088635621 |
| 8 | 2099202306201150041 |