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 | 1 |
| 2 | 110 |
| 3 | 2990 |
| 4 | 127570 |
| 5 | 4403225 |
| 6 | 167398110 |
| 7 | 6079401960 |
| 8 | 225574291125 |
| 9 | 8285469213945 |
| 10 | 305786452982260 |
| 11 | 11260066599241195 |
| 12 | 415073544779136460 |
| 13 | 15292958690004125565 |
| 14 | 563586551260018728505 |
| 15 | 20767361004817999220125 |