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 | 11 |
| 5 | 26 |
| 6 | 68 |
| 7 | 177 |
| 8 | 497 |
| 9 | 1475 |
| 10 | 4608 |
| 11 | 15188 |
| 12 | 52778 |
| 13 | 192339 |
| 14 | 733676 |
| 15 | 2917722 |
| 16 | 12052138 |
| 17 | 51517308 |
| 18 | 227068741 |
| 19 | 1028492568 |