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) |
|---|---|
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 19 |
| 6 | 213 |
| 7 | 3761 |
| 8 | 96373 |
| 9 | 3377487 |
| 10 | 154874569 |
| 11 | 8980530625 |
| 12 | 641008120761 |
| 13 | 55110586506119 |
| 14 | 5606337607922197 |
| 15 | 664893010179107529 |
| 16 | 90785224148218811149 |
| 17 | 14119839142088335522351 |
| 18 | 2478547355267024762146257 |