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 | 5 |
| 2 | 18 |
| 3 | 110 |
| 4 | 712 |
| 5 | 5427 |
| 6 | 44096 |
| 7 | 373019 |
| 8 | 3228862 |
| 9 | 28494961 |