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 | 3 |
| 2 | 7 |
| 3 | 15 |
| 4 | 35 |
| 5 | 57 |
| 6 | 99 |
| 7 | 429 |
| 8 | 445 |
| 9 | 731 |
| 10 | 5151 |
| 11 | 12619 |
| 12 | 30061 |
| 13 | 68517 |
| 14 | 111435 |
| 15 | 766963 |
| 16 | 5272667 |
| 17 | 5892979 |
| 18 | 10855425 |
| 19 | 11475773 |
| 20 | 34427205 |
| 21 | 200476101 |
| 22 | 879640035 |
| 23 | 879640081 |
| 24 | 5987618771 |
| 25 | 9464300559 |
| 26 | 13456046373 |
| 27 | 33028477513 |
| 28 | 85307471025 |