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 | 3512501 |
| 6 | 12650501 |
| 7 | 22598021 |
| 8 | 31562501 |
| 9 | 365328101 |
| 10 | 789062501 |
| 11 | 11412000101 |
| 12 | 64014060101 |