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 | 46 |
| 5 | 1350 |
| 6 | 34362 |
| 7 | 842751 |
| 8 | 20862684 |
| 9 | 533394516 |
| 10 | 14251251012 |
| 11 | 400275122533 |
| 12 | 11849888387786 |
| 13 | 370032953752618 |
| 14 | 12183464636804638 |
| 15 | 422529226131247475 |
| 16 | 15413172354966378040 |
| 17 | 590459747844232859976 |
| 18 | 23715530712277152761928 |
| 19 | 997006212536288359365609 |
| 20 | 43800374567467950834916070 |