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 | 5 |
| 2 | 27 |
| 3 | 877 |
| 4 | 15144 |
| 5 | 2387180 |
| 6 | 87852160 |
| 7 | 33093354906 |
| 8 | 2004646634218 |
| 9 | 1404640885994156 |
| 10 | 123560104158582188 |
| 11 | 140585911310274456089 |