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 | 3 |
| 3 | 4 |
| 4 | 12 |
| 5 | 27 |
| 6 | 84 |
| 7 | 247 |
| 8 | 826 |
| 9 | 2777 |
| 10 | 9868 |
| 11 | 35579 |
| 12 | 131847 |
| 13 | 495671 |
| 14 | 1893819 |
| 15 | 7320954 |
| 16 | 28619581 |
| 17 | 112923053 |
| 18 | 449343946 |
| 19 | 1801330288 |
| 20 | 7269849395 |
| 21 | 29517342098 |
| 22 | 120507480668 |
| 23 | 494449558111 |
| 24 | 2038073860257 |
| 25 | 8436185990286 |
| 26 | 35055744550563 |
| 27 | 146195133355612 |
| 28 | 611723431211193 |