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 | 15 |
| 2 | 1618 |
| 3 | 528491311 |
| 4 | 514843556263457213182266 |
| 5 | 28511235679461510605581038657982805983853648817939444953417128837 |