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 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 44 |
| 5 | 3459 |
| 6 | 21398845 |
| 7 | 204701870532176 |
| 8 | 47683439994850565666251869149 |
| 9 | 203292005443961363023193564438853229653319486912062841397 |