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 | 20 |
| 3 | 894 |
| 4 | 108292 |
| 5 | 39188597 |
| 6 | 45157269264 |
| 7 | 172969059719500 |
| 8 | 2268555493366383236 |
| 9 | 104065414379018585400528 |
| 10 | 16965802042440759287849083708 |
| 11 | 9953305892540385313201626908460431 |