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 | 56 |
| 2 | 153664 |
| 3 | 20661046784 |
| 4 | 136122083613085696 |
| 5 | 43944136529148801869643776 |
| 6 | 695135330857032999706040305346412544 |
| 7 | 538807794445443668301287736683760181725850763264 |