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 | 1 |
| 2 | 13 |
| 3 | 341 |
| 4 | 19531 |
| 5 | 2015539 |
| 6 | 329554457 |
| 7 | 78536544841 |
| 8 | 25736391511831 |
| 9 | 11111111111111111 |
| 10 | 6115909044841454629 |
| 11 | 4182283628124518315101 |
| 12 | 3479492117784426363920483 |
| 13 | 3461445831219105624193478971 |