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) |
|---|---|
| 0 | 1 |
| 1 | 13 |
| 2 | 143 |
| 3 | 1287 |
| 4 | 9321 |
| 5 | 62205 |
| 6 | 598455 |
| 7 | 7702695 |
| 8 | 78423345 |
| 9 | 647284365 |
| 10 | 9370936575 |
| 11 | 174468068775 |
| 12 | 2175194446425 |
| 13 | 25400498248125 |
| 14 | 529759106051175 |
| 15 | 11093219396634375 |
| 16 | 183808243512518625 |
| 17 | 2892889119253258125 |