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 | 10 |
| 3 | 132 |
| 4 | 4484 |
| 5 | 537057 |
| 6 | 157344756 |
| 7 | 126311779972 |
| 8 | 290106175842629 |
| 9 | 1813081182779342345 |