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 | 5 |
| 3 | 25 |
| 4 | 1727 |
| 5 | 3830879 |
| 6 | 33554425 |
| 7 | 19584403931 |
| 8 | 25086500333 |
| 9 | 23476467919565 |
| 10 | 4463061944990945 |