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 | 3 |
| 2 | 125970 |
| 3 | 44618574 |
| 4 | 1050274875 |
| 5 | 835668708875 |
| 6 | 87740042053973197350 |
| 7 | 249875247243953981660010 |
| 8 | 958593992854426686094086750 |
| 9 | 28077829144670491508241956182896750 |