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 | 9 |
| 2 | 15 |
| 3 | 55 |
| 4 | 89 |
| 5 | 321 |
| 6 | 519 |
| 7 | 1871 |
| 8 | 3025 |
| 9 | 10905 |
| 10 | 17631 |
| 11 | 63559 |
| 12 | 102761 |
| 13 | 370449 |
| 14 | 598935 |
| 15 | 2159135 |
| 16 | 3490849 |
| 17 | 12584361 |
| 18 | 20346159 |
| 19 | 73347031 |
| 20 | 118586105 |
| 21 | 427497825 |
| 22 | 691170471 |