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 | 2 |
| 2 | 18 |
| 3 | 6 |
| 4 | 1350 |
| 5 | 270 |
| 6 | 23814 |
| 7 | 17010 |
| 8 | 65063250 |
| 9 | 7229250 |
| 10 | 9762090030 |
| 11 | 4437313650 |
| 12 | 8267713725521250 |
| 13 | 635977978886250 |
| 14 | 81188783595533250 |
| 15 | 297692206516955250 |
| 16 | 22510683177794610356250 |
| 17 | 1564913803803903393750 |
| 18 | 40011216302189267004656036250 |
| 19 | 10529267447944543948593693750 |