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) |
|---|---|
| 3 | 16 |
| 4 | 104 |
| 5 | 5368 |
| 6 | 40880 |
| 7 | 2532160 |
| 8 | 20390552 |
| 9 | 1364393896 |
| 10 | 788854912240 |
| 11 | 6641649422408 |
| 12 | 4056611764783760 |
| 13 | 296528425830656800 |
| 14 | 2544627654221217656 |
| 15 | 188573151481968108424 |
| 16 | 121907205457107043376080 |