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 | 1 |
| 7 | 4 |
| 8 | 12 |
| 9 | 31 |
| 10 | 79 |
| 11 | 192 |
| 12 | 459 |
| 13 | 1082 |
| 14 | 2537 |
| 15 | 5922 |
| 16 | 13816 |
| 17 | 32222 |
| 18 | 75254 |
| 19 | 176034 |
| 20 | 412667 |
| 21 | 969531 |
| 22 | 2283278 |