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 | 4 |
| 2 | 18 |
| 3 | 88 |
| 4 | 435 |
| 5 | 2184 |
| 6 | 11018 |
| 7 | 55888 |
| 8 | 284229 |
| 9 | 1448800 |
| 10 | 7396290 |
| 11 | 37804344 |
| 12 | 193405121 |
| 13 | 990117104 |
| 14 | 5072380140 |