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 | 252 |
| 4 | 30897 |
| 5 | 14783632 |
| 6 | 27575294129 |
| 7 | 200493397340704 |
| 8 | 5683010875200460450 |
| 9 | 627998579658329070097348 |
| 10 | 270542136528524318473547313146 |
| 11 | 454367389836320183421616246521390670 |