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) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 10 |
| 3 | 11 |
| 4 | 20 |
| 5 | 101 |
| 6 | 110 |
| 7 | 111 |
| 8 | 120 |
| 9 | 201 |
| 10 | 210 |
| 11 | 1011 |
| 12 | 1020 |
| 13 | 1101 |
| 14 | 1110 |
| 15 | 1111 |
| 16 | 1120 |
| 17 | 1201 |
| 18 | 1210 |
| 19 | 2011 |
| 20 | 2020 |
| 21 | 2101 |
| 22 | 2110 |
| 23 | 10111 |
| 24 | 10120 |
| 25 | 10201 |
| 26 | 10210 |
| 27 | 11011 |
| 28 | 11020 |
| 29 | 11101 |
| 30 | 11110 |
| 31 | 11111 |
| 32 | 11120 |
| 33 | 11201 |
| 34 | 11210 |
| 35 | 12011 |
| 36 | 12020 |
| 37 | 12101 |
| 38 | 12110 |
| 39 | 20111 |