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 | 15 |
| 3 | 345 |
| 4 | 10695 |
| 5 | 417105 |
| 6 | 19603935 |
| 7 | 1078216425 |
| 8 | 67927634775 |
| 9 | 4822862069025 |
| 10 | 381006103452975 |
| 11 | 33147531000408825 |
| 12 | 3149015445038838375 |
| 13 | 324348590839000352625 |
| 14 | 36002693583129039141375 |
| 15 | 4284320536392355657823625 |
| 16 | 544108708121829168543600375 |
| 17 | 73454675596446937753386050625 |