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 | 1 |
| 3 | 1 |
| 4 | 7 |
| 5 | 90 |
| 6 | 1398 |
| 7 | 23 |
| 8 | 2100 |
| 9 | 6840 |
| 10 | 2912 |
| 11 | 416 |
| 12 | 1344 |
| 13 | 102198 |
| 14 | 1643968 |
| 15 | 42592 |
| 16 | 48128 |
| 17 | 1120128 |