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 | 14 |
| 2 | 112 |
| 3 | 672 |
| 4 | 3360 |
| 5 | 14784 |
| 6 | 59136 |
| 7 | 219648 |
| 8 | 768768 |
| 9 | 2562560 |
| 10 | 8200192 |
| 11 | 25346048 |
| 12 | 76038144 |
| 13 | 222265344 |
| 14 | 635043840 |
| 15 | 1778122752 |
| 16 | 4889837568 |
| 17 | 13231325184 |
| 18 | 35283533824 |
| 19 | 92851404800 |
| 20 | 241413652480 |
| 21 | 620777963520 |
| 22 | 1580162088960 |