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 | 5 |
| 2 | 59 |
| 3 | 569 |
| 4 | 599 |
| 5 | 659 |
| 6 | 5569 |
| 7 | 5659 |
| 8 | 5669 |
| 9 | 6569 |
| 10 | 6599 |
| 11 | 6659 |
| 12 | 6959 |
| 13 | 56569 |
| 14 | 56599 |
| 15 | 56659 |
| 16 | 56999 |
| 17 | 59659 |
| 18 | 59669 |
| 19 | 59699 |
| 20 | 59999 |
| 21 | 65599 |
| 22 | 65699 |
| 23 | 66569 |
| 24 | 66959 |
| 25 | 69959 |
| 26 | 95569 |
| 27 | 95959 |
| 28 | 96959 |
| 29 | 99559 |
| 30 | 556559 |
| 31 | 556999 |
| 32 | 565559 |
| 33 | 566659 |
| 34 | 566999 |
| 35 | 569599 |
| 36 | 569659 |
| 37 | 596569 |
| 38 | 596599 |
| 39 | 596669 |