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 | 4 |
| 2 | 52 |
| 3 | 232 |
| 4 | 1028 |
| 5 | 3846 |
| 6 | 16678 |
| 7 | 89584 |
| 8 | 409894 |
| 9 | 2166630 |
| 10 | 12433014 |
| 11 | 67381452 |
| 12 | 468282278 |
| 13 | 2914549798 |
| 14 | 23237125624 |
| 15 | 148957518364 |