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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 5 |
| 6 | 8 |
| 7 | 55 |
| 8 | 17711 |
| 9 | 63245986 |
| 10 | 165580141 |
| 11 | 498454011879264 |
| 12 | 14472334024676221 |
| 13 | 1100087778366101931 |
| 14 | 298611126818977066918552 |
| 15 | 781774079430987230203437 |
| 16 | 14028366653498915298923761 |
| 17 | 22698374052006863956975682 |
| 18 | 36726740705505779255899443 |
| 19 | 59425114757512643212875125 |