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 | 12 |
| 3 | 44 |
| 4 | 344 |
| 5 | 33328 |
| 6 | 58616531552 |
| 7 | 263752837930654539573558624 |
| 8 | 5521060336920386409400918079935910963482577804036340308751264 |