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) |
|---|---|
| 3 | 0 |
| 4 | 1 |
| 5 | 5 |
| 6 | 4 |
| 7 | 70 |
| 8 | 31 |
| 9 | 972 |
| 10 | 293 |
| 11 | 14476 |
| 12 | 3326 |
| 13 | 237575 |
| 14 | 44189 |
| 15 | 4305960 |
| 16 | 673471 |
| 17 | 85836485 |
| 18 | 11588884 |
| 19 | 1871150248 |
| 20 | 222304897 |