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 | 36 |
| 2 | 720 |
| 3 | 10560 |
| 4 | 126720 |
| 5 | 1317888 |
| 6 | 12300288 |
| 7 | 105431040 |
| 8 | 843448320 |
| 9 | 6372720640 |
| 10 | 45883588608 |
| 11 | 317013884928 |
| 12 | 2113425899520 |
| 13 | 13655982735360 |
| 14 | 85837605765120 |
| 15 | 526470648692736 |
| 16 | 3158823892156416 |
| 17 | 18581317012684800 |
| 18 | 107358720517734400 |
| 19 | 610249569258700800 |