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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | 3 |
| 8 | 27 |
| 9 | 146 |
| 10 | 492 |
| 11 | 1336 |
| 12 | 3156 |
| 13 | 7082 |
| 14 | 14938 |
| 15 | 29282 |
| 16 | 55012 |
| 17 | 100707 |
| 18 | 178063 |
| 19 | 306310 |
| 20 | 514381 |
| 21 | 846627 |
| 22 | 1370257 |