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) |
|---|---|
| 4 | 1 |
| 5 | 1 |
| 6 | 2 |
| 7 | 8 |
| 8 | 42 |
| 9 | 296 |
| 10 | 2635 |
| 11 | 25626 |
| 12 | 268394 |
| 13 | 2937495 |
| 14 | 33310550 |
| 15 | 388431688 |
| 16 | 4637550072 |
| 17 | 56493493990 |
| 18 | 700335433295 |