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 | 9 |
| 1 | 660 |
| 2 | 20592 |
| 3 | 411840 |
| 4 | 6223360 |
| 5 | 77395968 |
| 6 | 833495040 |
| 7 | 8033304576 |
| 8 | 70882099200 |
| 9 | 581979340800 |
| 10 | 4500640235520 |
| 11 | 33087710822400 |
| 12 | 232937484189696 |
| 13 | 1579462143508480 |
| 14 | 10363761453957120 |
| 15 | 66060621396836352 |