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 | 409 |
| 4 | 449 |
| 5 | 499 |
| 6 | 509 |
| 7 | 599 |
| 8 | 4049 |
| 9 | 4099 |
| 10 | 4409 |
| 11 | 4549 |
| 12 | 4909 |
| 13 | 4999 |
| 14 | 5009 |
| 15 | 5059 |
| 16 | 5099 |
| 17 | 5449 |
| 18 | 9049 |
| 19 | 9059 |
| 20 | 9949 |
| 21 | 40009 |
| 22 | 40099 |
| 23 | 40459 |
| 24 | 40499 |
| 25 | 40559 |
| 26 | 40949 |
| 27 | 44059 |
| 28 | 44449 |
| 29 | 44549 |
| 30 | 44909 |
| 31 | 44959 |
| 32 | 45599 |
| 33 | 45949 |
| 34 | 45959 |
| 35 | 49009 |
| 36 | 49409 |
| 37 | 49459 |
| 38 | 49499 |
| 39 | 49549 |
| 40 | 49559 |
| 41 | 49999 |
| 42 | 50459 |