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 | 1 |
| 3 | 5 |
| 4 | 17 |
| 5 | 81 |
| 6 | 343 |
| 7 | 1592 |
| 8 | 7551 |
| 9 | 34546 |
| 10 | 158402 |
| 11 | 734321 |
| 12 | 3389249 |
| 13 | 15610239 |
| 14 | 72045856 |
| 15 | 332515175 |
| 16 | 1533661362 |
| 17 | 7075164898 |
| 18 | 32644176977 |
| 19 | 150600651761 |
| 20 | 694773927239 |
| 21 | 3205360278072 |
| 22 | 14787893322847 |
| 23 | 68223139662242 |
| 24 | 314745564736962 |