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 | 9 |
| 3 | 41 |
| 4 | 391 |
| 5 | 9103 |
| 6 | 535951 |
| 7 | 80825743 |
| 8 | 31508994061 |
| 9 | 31937977439061 |
| 10 | 84479516648536637 |
| 11 | 584608936935076469309 |
| 12 | 10605380482241904040731709 |
| 13 | 505256047119225750718027007037 |
| 14 | 63321087426482869467351750978047037 |
| 15 | 20908732615936655362731019703436410620989 |