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) |
|---|---|
| 6 | 1 |
| 7 | 15 |
| 8 | 175 |
| 9 | 1960 |
| 10 | 25473 |
| 11 | 375165 |
| 12 | 5967170 |
| 13 | 99883410 |
| 14 | 1794863356 |
| 15 | 34897858996 |
| 16 | 729308423480 |
| 17 | 16183109779200 |
| 18 | 379985643499344 |
| 19 | 9441352087296912 |
| 20 | 247902890514328224 |
| 21 | 6852200357138738400 |
| 22 | 198716076620554542336 |