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) |
|---|---|
| 0 | 1 |
| 1 | 30 |
| 2 | 9845550 |
| 3 | 171634285407048750 |
| 4 | 193419995622362136809061156168750 |
| 5 | 14272693289804307141953423466197932293533748208968750 |