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 | 0 |
| 3 | 0 |
| 4 | 5 |
| 5 | 16 |
| 6 | 46 |
| 7 | 162 |
| 8 | 488 |
| 9 | 1282 |
| 10 | 3291 |
| 11 | 8607 |
| 12 | 22407 |
| 13 | 58892 |
| 14 | 156251 |
| 15 | 419489 |
| 16 | 1135860 |
| 17 | 3115246 |
| 18 | 8646507 |
| 19 | 24220195 |