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 | 20 |
| 13 | 229 |
| 14 | 921 |
| 15 | 7156 |
| 16 | 29567 |
| 17 | 193932 |
| 18 | 821797 |
| 19 | 4902336 |
| 20 | 21201528 |
| 21 | 119162697 |
| 22 | 523550761 |