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 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 97 |
| 5 | 6739 |
| 6 | 1611097 |
| 7 | 1295101469 |
| 8 | 3449859538455 |
| 9 | 30155591559236245 |
| 10 | 859063676925680110319 |
| 11 | 79361177641450830904290293 |