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) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 129 |
| 4 | 16936 |
| 5 | 2357964627 |
| 6 | 1794518358664 |
| 7 | 2862424846028174457 |
| 8 | 5483249282630830360396 |
| 9 | 39471589603944768518079950019 |
| 10 | 3053134546009996125349281528007992109928 |