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 | 1 |
| 1 | 1267650600228229401496703205377 |
| 2 | 515377520732011332304111729993850674198810727377 |
| 3 | 1606938044259505653062694103672199063651968615055494942823377 |