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) |
|---|---|
| 0 | 9 |
| 1 | 69 |
| 2 | 489 |
| 3 | 3429 |
| 4 | 24009 |
| 5 | 168069 |
| 6 | 1176489 |
| 7 | 8235429 |
| 8 | 57648009 |
| 9 | 403536069 |
| 10 | 2824752489 |
| 11 | 19773267429 |
| 12 | 138412872009 |
| 13 | 968890104069 |
| 14 | 6782230728489 |
| 15 | 47475615099429 |
| 16 | 332329305696009 |
| 17 | 2326305139872069 |
| 18 | 16284135979104489 |
| 19 | 113988951853731429 |