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 | 4 |
| 2 | 5 |
| 3 | 6 |
| 4 | 7 |
| 5 | 9 |
| 6 | 12 |
| 7 | 73 |
| 8 | 129 |
| 9 | 142 |
| 10 | 144 |
| 11 | 253 |
| 12 | 455 |
| 13 | 531 |
| 14 | 734 |
| 15 | 1009 |
| 16 | 1193 |
| 17 | 1553 |
| 18 | 2449 |
| 19 | 3309 |
| 20 | 13534 |
| 21 | 17513 |
| 22 | 17832 |
| 23 | 22852 |