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 | 42 |
| 2 | 1722 |
| 3 | 69741 |
| 4 | 2824080 |
| 5 | 114340800 |
| 6 | 4629407580 |
| 7 | 187434189600 |
| 8 | 7588784431200 |
| 9 | 307252630616400 |
| 10 | 12439960566432000 |
| 11 | 503665724648352000 |
| 12 | 20392280251485912000 |
| 13 | 825637071380896320000 |
| 14 | 33428168171083640640000 |