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 | 1 |
| 2 | 4096 |
| 3 | 531440 |
| 4 | 16777216 |
| 5 | 244140626 |
| 6 | 2176778240 |
| 7 | 13841287200 |
| 8 | 68719476736 |
| 9 | 282429005041 |
| 10 | 1000000004096 |
| 11 | 3138428376720 |
| 12 | 8916083671040 |
| 13 | 23298085122482 |
| 14 | 56693912371200 |
| 15 | 129746094281440 |
| 16 | 281474976710656 |
| 17 | 582622237229762 |
| 18 | 1156829204647936 |