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 | 145 |
| 4 | 925 |
| 5 | 28085 |
| 6 | 179401 |
| 7 | 5448301 |
| 8 | 34802825 |
| 9 | 1056942265 |
| 10 | 6751568605 |
| 11 | 205041351065 |
| 12 | 1309769506501 |
| 13 | 39776965164301 |
| 14 | 254088532692545 |
| 15 | 7716526200523285 |
| 16 | 49291865572847185 |
| 17 | 1496966305936352945 |
| 18 | 9562367832599661301 |
| 19 | 290403746825451948001 |