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 | 4 |
| 2 | 34 |
| 3 | 664 |
| 4 | 18446 |
| 5 | 887314 |
| 6 | 84946016 |
| 7 | 3086525014 |
| 8 | 557027507464 |
| 9 | 31110090768184 |
| 10 | 3404401335645584 |
| 11 | 609352762511672906 |