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 | 56 |
| 2 | 3360 |
| 3 | 206080 |
| 4 | 12776960 |
| 5 | 797282304 |
| 6 | 49963024384 |
| 7 | 3140532961280 |
| 8 | 197853576560640 |
| 9 | 12486759054049280 |
| 10 | 789163172215914496 |
| 11 | 49932506169297862656 |
| 12 | 3162392057388864634880 |
| 13 | 200447004252955727626240 |
| 14 | 12714067126901763295150080 |
| 15 | 806919460320698577132191744 |