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) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 112 |
| 4 | 3136 |
| 5 | 484096 |
| 6 | 153545728 |
| 7 | 72255188992 |
| 8 | 169225143107584 |
| 9 | 767806696376172544 |
| 10 | 5846826552577416232960 |
| 11 | 211692077904149369184059392 |
| 12 | 14577670180222125357773973618688 |