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 | 31 |
| 2 | 131 |
| 3 | 331 |
| 4 | 431 |
| 5 | 631 |
| 6 | 1031 |
| 7 | 1231 |
| 8 | 1531 |
| 9 | 1831 |
| 10 | 1931 |
| 11 | 2131 |
| 12 | 2531 |
| 13 | 2731 |
| 14 | 3331 |
| 15 | 3631 |
| 16 | 3931 |
| 17 | 4231 |
| 18 | 4831 |
| 19 | 4931 |
| 20 | 5231 |
| 21 | 5431 |
| 22 | 5531 |
| 23 | 6131 |
| 24 | 7331 |
| 25 | 8231 |
| 26 | 8431 |
| 27 | 8731 |
| 28 | 8831 |
| 29 | 9431 |
| 30 | 9631 |
| 31 | 9931 |
| 32 | 10331 |
| 33 | 10531 |
| 34 | 10631 |
| 35 | 10831 |
| 36 | 11131 |
| 37 | 11731 |
| 38 | 11831 |
| 39 | 13331 |
| 40 | 13831 |
| 41 | 13931 |