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 | 33 |
| 3 | 663 |
| 4 | 18445 |
| 5 | 887313 |
| 6 | 84946015 |
| 7 | 3086525013 |
| 8 | 557027507463 |
| 9 | 31110090768183 |
| 10 | 3404401335645583 |
| 11 | 609352762511672905 |