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 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 20 |
| 6 | 52 |
| 7 | 146 |
| 8 | 430 |
| 9 | 1306 |
| 10 | 4176 |
| 11 | 13832 |
| 12 | 47452 |
| 13 | 169044 |
| 14 | 619672 |
| 15 | 234225 |