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 | 10 |
| 2 | 11 |
| 3 | 21 |
| 4 | 101 |
| 5 | 121 |
| 6 | 201 |
| 7 | 221 |
| 8 | 301 |
| 9 | 321 |
| 10 | 1021 |
| 11 | 1101 |
| 12 | 1201 |
| 13 | 1221 |
| 14 | 1301 |
| 15 | 1321 |
| 16 | 2021 |
| 17 | 2121 |
| 18 | 2201 |
| 19 | 2301 |
| 20 | 2321 |
| 21 | 3001 |
| 22 | 3101 |
| 23 | 3121 |
| 24 | 3221 |
| 25 | 4001 |
| 26 | 4021 |
| 27 | 4101 |
| 28 | 4121 |
| 29 | 4201 |
| 30 | 4221 |
| 31 | 10101 |
| 32 | 10121 |
| 33 | 10221 |
| 34 | 10301 |
| 35 | 11021 |
| 36 | 11101 |
| 37 | 11201 |
| 38 | 11301 |
| 39 | 11321 |
| 40 | 12021 |
| 41 | 12121 |
| 42 | 12201 |
| 43 | 12321 |