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 | 7 |
| 1 | 3 |
| 2 | 7 |
| 3 | 141 |
| 4 | 31154 |
| 5 | 5919757544 |
| 6 | 160210422116327440975 |
| 7 | 51936028072305364257094751268091425897982 |
| 8 | 4468374619865723526161303689130955516769923438522458566697540434310939905017570043 |