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 | 7 |
| 3 | 51373 |
| 4 | 78127 |
| 5 | 138943 |
| 6 | 620299 |
| 7 | 2842933 |
| 8 | 137422693 |
| 9 | 2259290321 |
| 10 | 413879131637 |
| 11 | 434757575329 |
| 12 | 915535274009 |
| 13 | 14864856896743 |