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 | 1 |
| 2 | 1 |
| 3 | 0 |
| 4 | 1 |
| 5 | 7 |
| 6 | 97 |
| 7 | 1981 |
| 8 | 56611 |
| 9 | 2151857 |
| 10 | 104905809 |
| 11 | 6375234313 |
| 12 | 472007532691 |
| 13 | 41778412444165 |
| 14 | 4351370158008721 |
| 15 | 526176012328671173 |
| 16 | 73022861716667028531 |
| 17 | 11515387009980686269561 |