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 | 8 |
| 3 | 170 |
| 4 | 9110 |
| 5 | 1243692 |
| 6 | 427097893 |
| 7 | 373571747330 |
| 8 | 831176090437185 |
| 9 | 4696687907289825363 |