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 | 5 |
| 3 | 11 |
| 4 | 15 |
| 5 | 16 |
| 6 | 25 |
| 7 | 125 |
| 8 | 511 |
| 9 | 515 |
| 10 | 516 |
| 11 | 1125 |
| 12 | 2261 |
| 13 | 5125 |
| 14 | 12511 |
| 15 | 12515 |
| 16 | 25525 |
| 17 | 51211 |
| 18 | 125125 |
| 19 | 5162515 |
| 20 | 51626211 |
| 21 | 125162515 |
| 22 | 5162525125 |