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 | 1 |
| 2 | 7 |
| 3 | 43 |
| 4 | 253 |
| 5 | 1477 |
| 6 | 8611 |
| 7 | 50191 |
| 8 | 292537 |
| 9 | 1705033 |
| 10 | 9937663 |
| 11 | 57920947 |
| 12 | 337588021 |
| 13 | 1967607181 |
| 14 | 11468055067 |
| 15 | 66840723223 |
| 16 | 389576284273 |
| 17 | 2270616982417 |
| 18 | 13234125610231 |
| 19 | 77134136678971 |
| 20 | 449570694463597 |
| 21 | 2620290030102613 |
| 22 | 15272169486152083 |
| 23 | 89012726886809887 |
| 24 | 518804191834707241 |