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 | 40 |
| 13 | 399 |
| 14 | 2472 |
| 15 | 17436 |
| 16 | 98400 |
| 17 | 601626 |
| 18 | 3238694 |
| 19 | 18355742 |
| 20 | 96020478 |