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 | 1 |
| 2 | 12 |
| 3 | 129 |
| 4 | 1984 |
| 5 | 45945 |
| 6 | 1524156 |
| 7 | 68838217 |
| 8 | 4070403744 |
| 9 | 305642504529 |
| 10 | 28440008182540 |
| 11 | 3214141725643761 |
| 12 | 433856895597946272 |
| 13 | 68964321078341276809 |
| 14 | 12753724616472980432124 |
| 15 | 2715405762438952565521785 |
| 16 | 659549661987730244294458816 |
| 17 | 181293528280954206831103494177 |