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 | 57 |
| 2 | 261633 |
| 3 | 18014398375264257 |
| 4 | 5846006549323611672814736913013492849365380759553 |