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 | 39 |
| 2 | 159 |
| 3 | 359 |
| 4 | 639 |
| 5 | 999 |
| 6 | 1439 |
| 7 | 1959 |
| 8 | 2559 |
| 9 | 3239 |
| 10 | 3999 |
| 11 | 4839 |
| 12 | 5759 |
| 13 | 6759 |
| 14 | 7839 |
| 15 | 8999 |
| 16 | 10239 |
| 17 | 11559 |
| 18 | 12959 |
| 19 | 14439 |
| 20 | 15999 |
| 21 | 17639 |
| 22 | 19359 |
| 23 | 21159 |
| 24 | 23039 |
| 25 | 24999 |
| 26 | 27039 |
| 27 | 29159 |
| 28 | 31359 |
| 29 | 33639 |
| 30 | 35999 |
| 31 | 38439 |
| 32 | 40959 |
| 33 | 43559 |
| 34 | 46239 |
| 35 | 48999 |
| 36 | 51839 |
| 37 | 54759 |
| 38 | 57759 |
| 39 | 60839 |
| 40 | 63999 |
| 41 | 67239 |