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 | 31 |
| 3 | 131 |
| 4 | 151 |
| 5 | 631 |
| 6 | 751 |
| 7 | 3251 |
| 8 | 3881 |
| 9 | 16381 |
| 10 | 19381 |
| 11 | 19501 |
| 12 | 19531 |
| 13 | 78781 |
| 14 | 78901 |
| 15 | 81281 |
| 16 | 81401 |
| 17 | 81901 |
| 18 | 82031 |
| 19 | 93901 |
| 20 | 94531 |
| 21 | 97001 |
| 22 | 97501 |
| 23 | 97651 |
| 24 | 390751 |
| 25 | 390781 |
| 26 | 393901 |
| 27 | 394501 |
| 28 | 406381 |
| 29 | 468781 |
| 30 | 469501 |
| 31 | 471901 |
| 32 | 472631 |
| 33 | 484531 |
| 34 | 485131 |
| 35 | 487651 |
| 36 | 1953151 |
| 37 | 1953901 |