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 | 15 |
| 2 | 175 |
| 3 | 1750 |
| 4 | 15750 |
| 5 | 131250 |
| 6 | 1031250 |
| 7 | 7734375 |
| 8 | 55859375 |
| 9 | 391015625 |
| 10 | 2666015625 |
| 11 | 17773437500 |
| 12 | 116210937500 |
| 13 | 747070312500 |
| 14 | 4731445312500 |
| 15 | 29571533203125 |
| 16 | 182647705078125 |
| 17 | 1116180419921875 |
| 18 | 6755828857421875 |