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 | 105 |
| 6 | 6534 |
| 7 | 132444 |
| 8 | 1593960 |
| 9 | 13962848 |
| 10 | 98382912 |
| 11 | 590814336 |
| 12 | 3137815296 |
| 13 | 15114950400 |
| 14 | 67240622592 |
| 15 | 279977837568 |
| 16 | 1102376491008 |
| 17 | 4137416245248 |
| 18 | 14896905748480 |
| 19 | 51722619518976 |
| 20 | 173913487048704 |
| 21 | 568323403481088 |
| 22 | 1810359422681088 |
| 23 | 5635647921192960 |