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 | 6 |
| 1 | 48 |
| 2 | 282 |
| 3 | 1260 |
| 4 | 4896 |
| 5 | 16836 |
| 6 | 53232 |
| 7 | 156384 |
| 8 | 433776 |
| 9 | 1143696 |
| 10 | 2890266 |
| 11 | 7032576 |
| 12 | 16557084 |
| 13 | 37838052 |
| 14 | 84206724 |
| 15 | 182913216 |
| 16 | 388685430 |
| 17 | 809399280 |
| 18 | 1654446816 |
| 19 | 3323927340 |
| 20 | 6572070528 |
| 21 | 12801615744 |
| 22 | 24590359284 |
| 23 | 46619988384 |
| 24 | 87302773392 |
| 25 | 161597518272 |
| 26 | 295849759728 |