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 | 9 |
| 5 | 61 |
| 6 | 3441 |
| 7 | 11819871 |
| 8 | 139709267717593 |
| 9 | 19518679486184955909459972969 |
| 10 | 380978848884417414427615903969045678210740619589070918321 |