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 | 6 |
| 2 | 28 |
| 3 | 104 |
| 4 | 496 |
| 5 | 1568 |
| 6 | 7360 |
| 7 | 27520 |
| 8 | 130304 |
| 9 | 396800 |
| 10 | 1848320 |
| 11 | 6879232 |
| 12 | 32706560 |
| 13 | 103702528 |
| 14 | 485867520 |
| 15 | 1799258112 |
| 16 | 8569421824 |
| 17 | 25897336832 |
| 18 | 120686641152 |
| 19 | 448682000384 |
| 20 | 2137705676800 |
| 21 | 6768178495488 |
| 22 | 31718320898048 |
| 23 | 118691479945216 |
| 24 | 558749693509632 |