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 | 54 |
| 3 | 2862 |
| 4 | 150690 |
| 5 | 7905894 |
| 6 | 413992474 |
| 7 | 21654687592 |
| 8 | 1131904942380 |