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 | 7 |
| 2 | 235 |
| 3 | 237106794157 |
| 4 | 23515118109417094519614036454677229711469381810493772727748015786693526280375184463161423922194842717663158071196105 |