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 | 9 |
| 3 | 99 |
| 4 | 171 |
| 5 | 252 |
| 6 | 333 |
| 7 | 414 |
| 8 | 585 |
| 9 | 666 |
| 10 | 747 |
| 11 | 828 |
| 12 | 909 |
| 13 | 999 |
| 14 | 1881 |
| 15 | 2772 |
| 16 | 3663 |
| 17 | 4554 |
| 18 | 5445 |
| 19 | 6336 |
| 20 | 7227 |
| 21 | 8118 |
| 22 | 9009 |
| 23 | 9999 |
| 24 | 10701 |
| 25 | 11511 |
| 26 | 12321 |
| 27 | 13131 |
| 28 | 14841 |
| 29 | 15651 |
| 30 | 16461 |
| 31 | 17271 |
| 32 | 18081 |
| 33 | 18981 |
| 34 | 19791 |
| 35 | 20502 |
| 36 | 21312 |
| 37 | 22122 |
| 38 | 23832 |
| 39 | 24642 |
| 40 | 25452 |
| 41 | 26262 |