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 | 3 |
| 1 | 4 |
| 2 | 11 |
| 3 | 76 |
| 4 | 3571 |
| 5 | 7881196 |
| 6 | 38388099893011 |
| 7 | 910763447271179530132922476 |
| 8 | 512653048485188394162163283930413917147479973138989971 |