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 | 2 |
| 3 | 3 |
| 4 | 7 |
| 5 | 31 |
| 6 | 241 |
| 7 | 3121 |
| 8 | 65521 |
| 9 | 1879127177606120717127879344567470740879360001 |
| 10 | 1419564463863171507576408104556964008024375775796704645430601388670976000001 |