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) |
|---|---|
| 3 | 1 |
| 4 | 9 |
| 5 | 81 |
| 6 | 855 |
| 7 | 10758 |
| 8 | 159633 |
| 9 | 2750067 |
| 10 | 54178485 |
| 11 | 1204443432 |
| 12 | 29871630837 |
| 13 | 818490738402 |
| 14 | 24571782872034 |
| 15 | 802459134168208 |
| 16 | 28332664539686670 |
| 17 | 1075700621922471621 |
| 18 | 43710289920461797346 |
| 19 | 1893011243289589171122 |