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) |
|---|---|
| 2 | 1 |
| 3 | 4 |
| 4 | 9 |
| 5 | 25 |
| 6 | 58 |
| 7 | 142 |
| 8 | 324 |
| 9 | 748 |
| 10 | 1672 |
| 11 | 3736 |
| 12 | 8208 |
| 13 | 17968 |
| 14 | 38944 |
| 15 | 84064 |
| 16 | 180288 |
| 17 | 385216 |
| 18 | 819328 |