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 | 9 |
| 3 | 33 |
| 4 | 353 |
| 5 | 525 |
| 6 | 565 |
| 7 | 929 |
| 8 | 969 |
| 9 | 3553 |
| 10 | 35553 |
| 11 | 52125 |
| 12 | 52525 |
| 13 | 52925 |
| 14 | 56165 |
| 15 | 56565 |
| 16 | 56965 |
| 17 | 92129 |
| 18 | 92529 |
| 19 | 92929 |
| 20 | 96169 |
| 21 | 96569 |
| 22 | 96969 |
| 23 | 355553 |
| 24 | 3555553 |
| 25 | 5212125 |
| 26 | 5216125 |
| 27 | 5252525 |
| 28 | 5256525 |
| 29 | 5292925 |
| 30 | 5296925 |
| 31 | 5612165 |
| 32 | 5616165 |
| 33 | 5652565 |