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 | 223 |
| 3 | 3583 |
| 4 | 917503 |
| 5 | 14680063 |
| 6 | 3758096383 |
| 7 | 246290604621823 |
| 8 | 1340933598257652751063553648756520535666396731910651903 |