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 | 1 |
| 3 | 2 |
| 4 | 9 |
| 5 | 17 |
| 6 | 23 |
| 7 | 64 |
| 8 | 75 |
| 9 | 99 |
| 10 | 191 |
| 11 | 204 |
| 12 | 999 |
| 13 | 1747 |
| 14 | 1907 |
| 15 | 2365 |
| 16 | 2966 |
| 17 | 5731 |
| 18 | 9999 |
| 19 | 18991 |
| 20 | 20564 |
| 21 | 99999 |
| 22 | 174601 |
| 23 | 174747 |
| 24 | 179317 |
| 25 | 243063 |
| 26 | 293786 |
| 27 | 552101 |
| 28 | 999999 |
| 29 | 1868287 |
| 30 | 2967032 |
| 31 | 9200156 |
| 32 | 9999999 |
| 33 | 22765895 |
| 34 | 31552659 |
| 35 | 93809716 |
| 36 | 99999999 |
| 37 | 185812387 |
| 38 | 999999999 |