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 | 2 |
| 5 | 3 |
| 6 | 6 |
| 7 | 8 |
| 8 | 18 |
| 9 | 26 |
| 10 | 78 |
| 11 | 94 |
| 12 | 342 |
| 13 | 388 |
| 14 | 1660 |
| 15 | 1728 |
| 16 | 8592 |
| 17 | 8616 |
| 18 | 45068 |
| 19 | 46848 |
| 20 | 267536 |
| 21 | 282816 |