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 | 16 |
| 3 | 610 |
| 4 | 82188 |
| 5 | 45453172 |
| 6 | 99181510254 |
| 7 | 817394844786996 |
| 8 | 26269231937922520406 |