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 | 1 |
| 4 | 0 |
| 5 | 3 |
| 6 | 4 |
| 7 | 12 |
| 8 | 13 |
| 9 | 48 |
| 10 | 61 |
| 11 | 186 |
| 12 | 231 |
| 13 | 727 |
| 14 | 941 |
| 15 | 2855 |
| 16 | 3707 |
| 17 | 11293 |
| 18 | 14909 |
| 19 | 44955 |
| 20 | 59760 |
| 21 | 180092 |
| 22 | 241827 |