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 | 9 |
| 2 | 25 |
| 3 | 225 |
| 4 | 529 |
| 5 | 5929 |
| 6 | 29929 |
| 7 | 55225 |
| 8 | 99225 |
| 9 | 2295225 |
| 10 | 5929225 |
| 11 | 52229529 |
| 12 | 552955225 |
| 13 | 2952292225 |
| 14 | 9559559529 |
| 15 | 59299555225 |
| 16 | 5929599995929 |
| 17 | 9552259592929 |
| 18 | 5255925929995225 |
| 19 | 5555255292952225 |
| 20 | 92922592295555529529 |
| 21 | 959995929252599292299929255225 |
| 22 | 5955252925229529299525595522529225 |