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 | 41 |
| 3 | 141 |
| 4 | 5141 |
| 5 | 95141 |
| 6 | 295141 |
| 7 | 6295141 |
| 8 | 56295141 |
| 9 | 356295141 |
| 10 | 5356295141 |
| 11 | 85356295141 |
| 12 | 985356295141 |
| 13 | 7985356295141 |
| 14 | 97985356295141 |
| 15 | 397985356295141 |
| 16 | 2397985356295141 |
| 17 | 32397985356295141 |
| 18 | 832397985356295141 |
| 19 | 4832397985356295141 |
| 20 | 64832397985356295141 |
| 21 | 264832397985356295141 |