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) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 10 |
| 3 | 28 |
| 4 | 0 |
| 5 | 88 |
| 6 | 4524 |
| 7 | 0 |
| 8 | 140692 |
| 9 | 820496 |
| 10 | 0 |
| 11 | 128850048 |
| 12 | 1957725000 |
| 13 | 0 |
| 14 | 605917055356 |
| 15 | 13404947681712 |
| 16 | 0 |