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 | 1 |
| 2 | 4 |
| 3 | 0 |
| 4 | 16 |
| 5 | 40 |
| 6 | 192 |
| 7 | 560 |
| 8 | 3328 |
| 9 | 11772 |
| 10 | 63840 |
| 11 | 259336 |
| 12 | 1550976 |
| 13 | 7169656 |
| 14 | 42410256 |
| 15 | 234044160 |
| 16 | 1366190592 |