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 | 23 |
| 4 | 71 |
| 5 | 311 |
| 6 | 479 |
| 7 | 1559 |
| 8 | 5711 |
| 9 | 10559 |
| 10 | 18191 |
| 11 | 31391 |
| 12 | 422231 |
| 13 | 701399 |
| 14 | 3818929 |
| 15 | 9257329 |
| 16 | 22000801 |
| 17 | 36415991 |
| 18 | 48473881 |
| 19 | 175244281 |
| 20 | 427733329 |
| 21 | 3389934071 |
| 22 | 7979490791 |
| 23 | 36504256799 |
| 24 | 89206899239 |
| 25 | 121560956039 |
| 26 | 395668053479 |
| 27 | 513928659191 |
| 28 | 5528920734431 |
| 29 | 8402847753431 |
| 30 | 70864718555231 |