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 | 1 |
| 7 | 4 |
| 8 | 41 |
| 9 | 1981 |
| 10 | 304495 |
| 11 | 78322915 |
| 12 | 27033154060 |
| 13 | 11934777413004 |
| 14 | 6593485023087880 |
| 15 | 4485517185017428244 |
| 16 | 3707462300996566329965 |
| 17 | 3680029088808677189795063 |
| 18 | 4341813441626419937873317841 |
| 19 | 6033239205199247162872884404386 |
| 20 | 9792722283774374706204648839780148 |