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 | 3 |
| 3 | 5 |
| 4 | 87 |
| 5 | 31 |
| 6 | 10215 |
| 7 | 2675 |
| 8 | 2030721 |
| 9 | 3791353 |
| 10 | 21043039755 |
| 11 | 3617048975 |
| 12 | 456510966890031 |
| 13 | 66989072882759 |
| 14 | 4380916942893971361 |
| 15 | 8410761713598485675 |
| 16 | 4355410489470724905492213 |
| 17 | 2471070675390828342358441 |
| 18 | 8410576873515817323688553597445 |