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 | 1 |
| 3 | 3 |
| 4 | 22 |
| 5 | 197 |
| 6 | 2248 |
| 7 | 31311 |
| 8 | 514592 |
| 9 | 9750137 |
| 10 | 209265504 |
| 11 | 5018169035 |
| 12 | 132971582976 |
| 13 | 3858414981085 |
| 14 | 121679533902592 |
| 15 | 4143895711622327 |
| 16 | 151566138479037952 |
| 17 | 5925617619735873969 |