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) |
|---|---|
| 11 | 5 |
| 12 | 10 |
| 13 | 19 |
| 14 | 18 |
| 15 | 3801 |
| 16 | 6167 |
| 17 | 251529 |
| 18 | 128019 |
| 19 | 13780180 |
| 20 | 20576 |