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 | 0 |
| 2 | 3 |
| 3 | 8 |
| 4 | 99 |
| 5 | 323 |
| 6 | 575 |
| 7 | 4224 |
| 8 | 5775 |
| 9 | 9999 |
| 10 | 36863 |
| 11 | 42024 |
| 12 | 999999 |
| 13 | 3055503 |
| 14 | 3640463 |
| 15 | 5597955 |
| 16 | 8803088 |
| 17 | 32855823 |
| 18 | 99999999 |
| 19 | 360696063 |
| 20 | 422919224 |
| 21 | 9999999999 |
| 22 | 30485858403 |
| 23 | 30536863503 |
| 24 | 32154945123 |
| 25 | 59080108095 |
| 26 | 86310801368 |
| 27 | 304816618403 |
| 28 | 999999999999 |
| 29 | 3490500050943 |