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 | 1 |
| 3 | 3 |
| 4 | 72 |
| 5 | 11423 |
| 6 | 11187798 |
| 7 | 65460885384 |
| 8 | 2247082682913972 |
| 9 | 447548280314975144427 |
| 10 | 513427482871084962707467332 |