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 | 4 |
| 2 | 6 |
| 3 | 9 |
| 4 | 38 |
| 5 | 39 |
| 6 | 49 |
| 7 | 69 |
| 8 | 169 |
| 9 | 278 |
| 10 | 289 |
| 11 | 299 |
| 12 | 489 |
| 13 | 589 |
| 14 | 689 |
| 15 | 699 |
| 16 | 799 |
| 17 | 899 |
| 18 | 2899 |
| 19 | 3899 |
| 20 | 4989 |
| 21 | 5899 |
| 22 | 5999 |
| 23 | 6999 |
| 24 | 7999 |
| 25 | 9899 |
| 26 | 19999 |
| 27 | 29999 |
| 28 | 48999 |
| 29 | 58999 |
| 30 | 68999 |
| 31 | 69999 |
| 32 | 88999 |
| 33 | 99899 |
| 34 | 299899 |
| 35 | 398999 |
| 36 | 589989 |
| 37 | 589999 |
| 38 | 689999 |
| 39 | 798999 |
| 40 | 889999 |
| 41 | 899999 |
| 42 | 2899999 |
| 43 | 3899999 |