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 | 21 |
| 2 | 42 |
| 3 | 63 |
| 4 | 84 |
| 5 | 105 |
| 6 | 126 |
| 7 | 147 |
| 8 | 168 |
| 9 | 189 |
| 10 | 2010 |
| 11 | 2211 |
| 12 | 2412 |
| 13 | 2613 |
| 14 | 2814 |
| 15 | 3015 |
| 16 | 3216 |
| 17 | 3417 |
| 18 | 3618 |
| 19 | 3819 |
| 20 | 4020 |
| 21 | 4221 |
| 22 | 4422 |
| 23 | 4623 |
| 24 | 4824 |
| 25 | 5025 |
| 26 | 5226 |
| 27 | 5427 |
| 28 | 5628 |
| 29 | 5829 |
| 30 | 6030 |
| 31 | 6231 |
| 32 | 6432 |
| 33 | 6633 |
| 34 | 6834 |
| 35 | 7035 |
| 36 | 7236 |
| 37 | 7437 |
| 38 | 7638 |
| 39 | 7839 |
| 40 | 8040 |
| 41 | 8241 |
| 42 | 8442 |
| 43 | 8643 |
| 44 | 8844 |
| 45 | 9045 |