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) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 40 |
| 3 | 168 |
| 4 | 648 |
| 5 | 2376 |
| 6 | 8424 |
| 7 | 29160 |
| 8 | 99144 |
| 9 | 332424 |
| 10 | 1102248 |
| 11 | 3621672 |
| 12 | 11809800 |
| 13 | 38263752 |
| 14 | 123294312 |
| 15 | 395392104 |
| 16 | 1262703816 |
| 17 | 4017693960 |
| 18 | 12741829416 |
| 19 | 40291730856 |
| 20 | 127073920392 |
| 21 | 399817944648 |
| 22 | 1255242384360 |
| 23 | 3933092804328 |