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 | 4 |
| 2 | 9 |
| 3 | 25 |
| 4 | 49 |
| 5 | 169 |
| 6 | 289 |
| 7 | 1369 |
| 8 | 4489 |
| 9 | 6889 |
| 10 | 11449 |
| 11 | 27889 |
| 12 | 113569 |
| 13 | 134689 |
| 14 | 146689 |
| 15 | 344569 |
| 16 | 2778889 |
| 17 | 27777888889 |
| 18 | 111113555569 |
| 19 | 111133556689 |
| 20 | 111333666889 |
| 21 | 113344668889 |
| 22 | 444444888889 |
| 23 | 1111133355666889 |
| 24 | 1133444466888889 |