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 | 5 |
| 2 | 101 |
| 3 | 62501 |
| 4 | 1020101 |
| 5 | 31562501 |
| 6 | 139476101 |
| 7 | 637562501 |
| 8 | 789062501 |
| 9 | 985502501 |
| 10 | 2656262501 |
| 11 | 7455062501 |
| 12 | 19726562501 |
| 13 | 53662562501 |