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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 30 |
| 6 | 600 |
| 7 | 11760 |
| 8 | 257040 |
| 9 | 6048000 |
| 10 | 147571200 |
| 11 | 802982400 |
| 12 | 105409382400 |
| 13 | 3116065075200 |
| 14 | 97103204352000 |
| 15 | 3208697597952000 |
| 16 | 111992720007168000 |