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 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 50 |
| 6 | 194 |
| 7 | 1319 |
| 8 | 8834 |
| 9 | 117869 |
| 10 | 1269734 |
| 11 | 560616089 |
| 12 | 510535634 |
| 13 | 750085374614 |
| 14 | 2035030321602194 |
| 15 | 223759362505832069 |
| 16 | 764885974089796574 |
| 17 | 2887808734792025240864461034 |
| 18 | 716116205417604827135407034 |