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 | 3 |
| 2 | 9 |
| 3 | 5 |
| 4 | 127 |
| 5 | 124273 |
| 6 | 385829 |
| 7 | 70009765747 |
| 8 | 220026935042111 |
| 9 | 59574747365570286907 |
| 10 | 113453152114585319883313 |
| 11 | 4471148647570383262775217527741887 |