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 | 18 |
| 2 | 810 |
| 3 | 21870 |
| 4 | 446148 |
| 5 | 7676370 |
| 6 | 117979902 |
| 7 | 1674039150 |
| 8 | 22384294920 |
| 9 | 285916320882 |
| 10 | 3521652245010 |
| 11 | 42113381995278 |
| 12 | 491427393476940 |
| 13 | 5617523480607090 |
| 14 | 63094193590782438 |
| 15 | 697970937800860110 |