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 | 409 |
| 2 | 449 |
| 3 | 499 |
| 4 | 4049 |
| 5 | 4099 |
| 6 | 4409 |
| 7 | 4909 |
| 8 | 4999 |
| 9 | 9049 |
| 10 | 9949 |
| 11 | 40009 |
| 12 | 40099 |
| 13 | 40499 |
| 14 | 40949 |
| 15 | 44449 |
| 16 | 44909 |
| 17 | 49009 |
| 18 | 49409 |
| 19 | 49499 |
| 20 | 49999 |
| 21 | 90499 |
| 22 | 94009 |
| 23 | 94049 |
| 24 | 94099 |
| 25 | 94949 |
| 26 | 94999 |
| 27 | 99409 |
| 28 | 400009 |
| 29 | 400409 |
| 30 | 400949 |
| 31 | 404009 |
| 32 | 404099 |
| 33 | 404449 |
| 34 | 409099 |
| 35 | 409499 |
| 36 | 409909 |
| 37 | 409999 |