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 | 15 |
| 2 | 90 |
| 3 | 3360 |
| 4 | 2618880 |
| 5 | 5059200 |
| 6 | 4873497600 |
| 7 | 7381524480 |
| 8 | 27990144000 |
| 9 | 57846297600 |
| 10 | 4609292688000 |
| 11 | 4440104532864000 |
| 12 | 106644933787392000 |
| 13 | 164741543366400000 |
| 14 | 454310107592140800 |
| 15 | 1084892424295680000 |
| 16 | 1160492902900531200 |
| 17 | 10932800808939609600 |