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 | 4 |
| 3 | 13 |
| 4 | 32 |
| 5 | 104 |
| 6 | 228 |
| 7 | 576 |
| 8 | 1408 |
| 9 | 4104 |
| 10 | 9824 |
| 11 | 19152 |
| 12 | 39816 |
| 13 | 82944 |
| 14 | 196992 |
| 15 | 441294 |
| 16 | 881280 |
| 17 | 1911168 |
| 18 | 4539024 |