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 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 4 |
| 8 | 11 |
| 9 | 35 |
| 10 | 101 |
| 11 | 290 |
| 12 | 804 |
| 13 | 2256 |
| 14 | 6296 |
| 15 | 17689 |
| 16 | 49952 |
| 17 | 142016 |
| 18 | 406330 |
| 19 | 1169356 |
| 20 | 3390052 |