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 | 136 |
| 9 | 969 |
| 10 | 5985 |
| 11 | 33649 |
| 12 | 177100 |
| 13 | 888030 |
| 14 | 4292145 |
| 15 | 20160075 |
| 16 | 92561040 |
| 17 | 417225900 |
| 18 | 1852482996 |
| 19 | 8122425444 |
| 20 | 35240152720 |
| 21 | 151532656696 |
| 22 | 646626422970 |
| 23 | 2741188875414 |
| 24 | 11554258485616 |
| 25 | 48459472266975 |