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 | 2583 |
| 2 | 1196837 |
| 3 | 501622631 |
| 4 | 195675787426 |
| 5 | 71952946981858 |
| 6 | 25239894694049776 |