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 | 1 |
| 2 | 3 |
| 3 | 25 |
| 4 | 423 |
| 5 | 16261 |
| 6 | 1266843 |
| 7 | 200830225 |
| 8 | 65750156223 |
| 9 | 42834021462061 |
| 10 | 55174125327583923 |