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 | 0 |
| 2 | 2 |
| 3 | 13 |
| 4 | 1597 |
| 5 | 1134903170 |
| 6 | 3416454622906707 |
| 7 | 10284720757613717413913 |
| 8 | 394810887814999156320699623170776339 |