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) |
|---|---|
| 1 | 7 |
| 2 | 18 |
| 3 | 286 |
| 4 | 3010 |
| 5 | 32890 |
| 6 | 769230 |
| 7 | 3333330 |
| 8 | 159189030 |
| 9 | 16015883940 |
| 10 | 477463360374 |
| 11 | 21643407275490 |
| 12 | 1148540321999070 |
| 13 | 18489352726664820 |
| 14 | 4561561662153109614 |
| 15 | 71000485538666794110 |
| 16 | 14440652550858108745170 |
| 17 | 927869754030522488795610 |