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 | 2 |
| 3 | 3 |
| 4 | 8 |
| 5 | 43 |
| 6 | 1454 |
| 7 | 1131985 |
| 8 | 12199587820 |
| 9 | 2697830531268481 |
| 10 | 15224736759268778589978 |
| 11 | 2750892227033887206264514123491 |