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 | 3 |
| 2 | 21 |
| 3 | 341 |
| 4 | 10923 |
| 5 | 699051 |
| 6 | 89478485 |
| 7 | 22906492245 |
| 8 | 11728124029611 |
| 9 | 12009599006321323 |
| 10 | 24595658764946068821 |
| 11 | 100743818301219097892181 |
| 12 | 825293359523586849932749483 |
| 13 | 13521606402434446949298167524011 |