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 | 2 |
| 2 | 4 |
| 3 | 10 |
| 4 | 46 |
| 5 | 1372 |
| 6 | 475499108 |
| 7 | 1038397981840994509577948 |
| 8 | 10825608503765473087803384381127710579846422820261084889808 |