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) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 35 |
| 3 | 656 |
| 4 | 25509 |
| 5 | 2026564 |
| 6 | 326603719 |
| 7 | 106355219008 |
| 8 | 69808185542089 |
| 9 | 92203545302072964 |
| 10 | 244779396712068825067 |
| 11 | 1305009502037405316440848 |
| 12 | 13963029918525356899170492525 |
| 13 | 299675759834305402824238609624548 |