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 | 27 |
| 3 | 74 |
| 4 | 283 |
| 5 | 1219 |
| 6 | 3854 |
| 7 | 14639 |
| 8 | 63093 |
| 9 | 222254 |
| 10 | 867269 |
| 11 | 3651231 |
| 12 | 13909218 |
| 13 | 55448467 |
| 14 | 230250019 |
| 15 | 911892066 |
| 16 | 3685592711 |
| 17 | 15189545391 |
| 18 | 61267056156 |
| 19 | 249395546907 |
| 20 | 1024061684191 |
| 21 | 4165273608452 |
| 22 | 17011882082021 |
| 23 | 69737883682027 |