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) |
|---|---|
| 3 | 26 |
| 4 | 72 |
| 5 | 198 |
| 6 | 570 |
| 7 | 1641 |
| 8 | 4725 |
| 9 | 13605 |
| 10 | 39174 |