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 | 210 |
| 2 | 1210 |
| 3 | 2100 |
| 4 | 12100 |
| 5 | 21000 |
| 6 | 21021 |
| 7 | 36522 |
| 8 | 63141 |
| 9 | 89195 |
| 10 | 92029 |
| 11 | 112132 |
| 12 | 116010 |
| 13 | 118461 |
| 14 | 121000 |
| 15 | 149851 |
| 16 | 203013 |
| 17 | 203202 |
| 18 | 210000 |
| 19 | 214456 |
| 20 | 303142 |
| 21 | 304341 |
| 22 | 313230 |
| 23 | 323723 |
| 24 | 331401 |
| 25 | 351760 |
| 26 | 416213 |
| 27 | 441532 |
| 28 | 524371 |
| 29 | 534656 |
| 30 | 574915 |
| 31 | 610171 |
| 32 | 654560 |
| 33 | 897648 |
| 34 | 999643 |