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 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 40 |
| 6 | 41 |
| 7 | 42 |
| 8 | 43 |
| 9 | 44 |
| 10 | 430 |
| 11 | 431 |
| 12 | 432 |
| 13 | 433 |
| 14 | 434 |
| 15 | 4320 |
| 16 | 4321 |
| 17 | 4322 |
| 18 | 4323 |
| 19 | 4324 |
| 20 | 43210 |
| 21 | 43211 |
| 22 | 43212 |
| 23 | 43213 |
| 24 | 43214 |
| 25 | 432100 |
| 26 | 432101 |
| 27 | 432102 |
| 28 | 432103 |
| 29 | 432104 |
| 30 | 432140 |
| 31 | 432141 |
| 32 | 432142 |
| 33 | 432143 |
| 34 | 432144 |
| 35 | 4321030 |
| 36 | 4321031 |
| 37 | 4321032 |
| 38 | 4321033 |
| 39 | 4321034 |