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) |
|---|---|
| 3 | 4 |
| 4 | 8 |
| 5 | 16 |
| 6 | 36 |
| 7 | 81 |
| 8 | 180 |
| 9 | 400 |
| 10 | 900 |
| 11 | 2025 |
| 12 | 4500 |
| 13 | 10000 |
| 14 | 22200 |
| 15 | 49284 |
| 16 | 108336 |
| 17 | 238144 |
| 18 | 521672 |
| 19 | 1142761 |
| 20 | 2484356 |