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 | 139 |
| 2 | 239 |
| 3 | 439 |
| 4 | 739 |
| 5 | 839 |
| 6 | 1039 |
| 7 | 1439 |
| 8 | 2039 |
| 9 | 2239 |
| 10 | 2339 |
| 11 | 2539 |
| 12 | 2939 |
| 13 | 3539 |
| 14 | 3739 |
| 15 | 4139 |
| 16 | 4339 |
| 17 | 4639 |
| 18 | 5039 |
| 19 | 5639 |
| 20 | 5839 |
| 21 | 5939 |
| 22 | 7039 |
| 23 | 7639 |
| 24 | 8039 |
| 25 | 8539 |
| 26 | 8839 |
| 27 | 9239 |
| 28 | 9439 |
| 29 | 9539 |
| 30 | 9739 |
| 31 | 9839 |
| 32 | 10039 |
| 33 | 10139 |
| 34 | 10639 |
| 35 | 10739 |
| 36 | 10939 |
| 37 | 11239 |
| 38 | 11839 |
| 39 | 11939 |
| 40 | 12239 |
| 41 | 12539 |
| 42 | 12739 |