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 | 1 |
| 6 | 15 |
| 7 | 175 |
| 8 | 1960 |
| 9 | 22449 |
| 10 | 269325 |
| 11 | 3416930 |
| 12 | 45995730 |
| 13 | 657206836 |
| 14 | 9957703756 |
| 15 | 159721605680 |
| 16 | 2706813345600 |
| 17 | 48366009233424 |
| 18 | 909299905844112 |
| 19 | 17950712280921504 |
| 20 | 371384787345228000 |
| 21 | 8037811822645051776 |
| 22 | 181664979520697076096 |
| 23 | 4280722865357147142912 |
| 24 | 105005310755917452984576 |