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 | 2 |
| 2 | 8 |
| 3 | 18 |
| 4 | 36 |
| 5 | 66 |
| 6 | 120 |
| 7 | 210 |
| 8 | 360 |
| 9 | 618 |
| 10 | 1052 |
| 11 | 1790 |
| 12 | 3040 |
| 13 | 5162 |
| 14 | 8756 |
| 15 | 14854 |
| 16 | 25192 |
| 17 | 42722 |
| 18 | 72444 |
| 19 | 122846 |
| 20 | 208304 |
| 21 | 353210 |