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 | 3 |
| 2 | 15 |
| 3 | 1197 |
| 4 | 345519 |
| 5 | 434469343 |
| 6 | 2825994465190 |
| 7 | 92942728755412088 |
| 8 | 14666832942979847986346 |
| 9 | 11206356242764353017982723900 |