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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 26 |
| 5 | 937 |
| 6 | 45747 |
| 7 | 2945144 |
| 8 | 242899690 |
| 9 | 25034354941 |
| 10 | 3157647587689 |
| 11 | 478931493603308 |
| 12 | 86057396214591300 |
| 13 | 18086772915953351382 |
| 14 | 4397414569504319733812 |
| 15 | 1224945090342466220614714 |
| 16 | 387654163770235904289085798 |
| 17 | 138333762956844287480268151988 |