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 | 90 |
| 2 | 150 |
| 3 | 1721342310 |
| 4 | 140117185019831836588493434554119984790 |
| 5 | 113427455640312821160607117168492587690 |