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 | 49 |
| 2 | 109 |
| 3 | 307121 |
| 4 | 3837881 |
| 5 | 415922011 |
| 6 | 44886856951 |
| 7 | 73071640562111 |
| 8 | 11741452251865261 |
| 9 | 138599925259848671 |