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 | 1 |
| 2 | 5 |
| 3 | 59 |
| 4 | 1263 |
| 5 | 42713 |
| 6 | 2094399 |
| 7 | 140434335 |
| 8 | 12340275539 |
| 9 | 1375857855221 |
| 10 | 189751578038547 |
| 11 | 31714568837559539 |
| 12 | 6316261763436325285 |
| 13 | 1477890415844440910325 |
| 14 | 401400487846091289175217 |
| 15 | 125247016772173387008904623 |
| 16 | 44493481073675052201518261955 |