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 | 6 |
| 2 | 540 |
| 3 | 184680 |
| 4 | 157600080 |
| 5 | 270419925600 |
| 6 | 816984611467200 |
| 7 | 3971317527112003200 |
| 8 | 29097143353353192480000 |
| 9 | 305823675529741700675520000 |
| 10 | 4435486895868663971869188480000 |
| 11 | 86036822683997062842122964537600000 |
| 12 | 2175352015640142857526698650779456000000 |