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) |
|---|---|
| 13 | 1 |
| 14 | 1 |
| 15 | 4 |
| 16 | 19 |
| 17 | 1972 |
| 18 | 971171 |