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 | 4 |
| 2 | 60 |
| 3 | 3232 |
| 4 | 1058494 |
| 5 | 3062815568 |
| 6 | 90462380211862 |
| 7 | 29201160476766771330 |
| 8 | 108134253835820664368578112 |