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) |
|---|---|
| 5 | 1 |
| 6 | 12 |
| 7 | 84 |
| 8 | 448 |
| 9 | 2016 |
| 10 | 8064 |
| 11 | 29568 |
| 12 | 101376 |
| 13 | 329472 |
| 14 | 1025024 |
| 15 | 3075072 |
| 16 | 8945664 |
| 17 | 25346048 |
| 18 | 70189056 |
| 19 | 190513152 |
| 20 | 508035072 |
| 21 | 1333592064 |
| 22 | 3451650048 |
| 23 | 8820883456 |
| 24 | 22284337152 |
| 25 | 55710842880 |
| 26 | 137950658560 |
| 27 | 338606161920 |