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 | 3 |
| 2 | 11 |
| 3 | 13 |
| 4 | 31 |
| 5 | 83 |
| 6 | 113 |
| 7 | 131 |
| 8 | 181 |
| 9 | 311 |
| 10 | 313 |
| 11 | 331 |
| 12 | 383 |
| 13 | 811 |
| 14 | 881 |
| 15 | 883 |
| 16 | 1181 |
| 17 | 1381 |
| 18 | 1811 |
| 19 | 1831 |
| 20 | 3181 |
| 21 | 3313 |
| 22 | 3331 |
| 23 | 3833 |
| 24 | 3881 |
| 25 | 8111 |
| 26 | 8311 |
| 27 | 8831 |
| 28 | 11113 |
| 29 | 11131 |
| 30 | 11311 |
| 31 | 11383 |
| 32 | 11813 |
| 33 | 11831 |
| 34 | 11833 |
| 35 | 13183 |
| 36 | 13313 |
| 37 | 13331 |
| 38 | 13381 |
| 39 | 13831 |
| 40 | 13883 |
| 41 | 18131 |
| 42 | 18133 |
| 43 | 18181 |
| 44 | 18311 |