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) |
|---|---|
| 2 | 2 |
| 3 | 6 |
| 4 | 19 |
| 5 | 78 |
| 6 | 425 |
| 7 | 2484 |
| 8 | 18167 |
| 9 | 137444 |
| 10 | 1238979 |