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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 90 |
| 4 | 3150 |
| 5 | 81900 |
| 6 | 1992060 |
| 7 | 48771450 |
| 8 | 1237774230 |
| 9 | 32978969100 |
| 10 | 927339227100 |
| 11 | 27566149731120 |
| 12 | 866148362679600 |
| 13 | 28735959507074820 |
| 14 | 1005105838958594100 |
| 15 | 36999204981675832350 |
| 16 | 1430792213377354462530 |
| 17 | 58019598569681129648700 |