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 | 13 |
| 2 | 113 |
| 3 | 131 |
| 4 | 137 |
| 5 | 139 |
| 6 | 313 |
| 7 | 613 |
| 8 | 1013 |
| 9 | 1213 |
| 10 | 1301 |
| 11 | 1303 |
| 12 | 1307 |
| 13 | 1319 |
| 14 | 1321 |
| 15 | 1327 |
| 16 | 1361 |
| 17 | 1367 |
| 18 | 1373 |
| 19 | 1381 |
| 20 | 1399 |
| 21 | 1613 |
| 22 | 1913 |
| 23 | 2113 |
| 24 | 2131 |
| 25 | 2137 |
| 26 | 2213 |
| 27 | 2713 |
| 28 | 3137 |
| 29 | 3313 |
| 30 | 3413 |
| 31 | 3613 |
| 32 | 4013 |
| 33 | 4133 |
| 34 | 4139 |
| 35 | 4513 |
| 36 | 4813 |
| 37 | 5113 |
| 38 | 5413 |
| 39 | 5813 |
| 40 | 6113 |
| 41 | 6131 |
| 42 | 6133 |
| 43 | 7013 |
| 44 | 7213 |
| 45 | 8513 |