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 | 8 |
| 3 | 219 |
| 4 | 21098 |
| 5 | 6892031 |
| 6 | 7785598672 |
| 7 | 30241030285680 |
| 8 | 403845370764198967 |
| 9 | 18541589058526001745929 |