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 | 0 |
| 2 | 1 |
| 3 | 6643 |
| 4 | 1422773 |
| 5 | 5415589 |
| 6 | 90396755477 |
| 7 | 381920985378904469 |
| 8 | 1922624336133018996235 |
| 9 | 2004595370006815987563563 |
| 10 | 8022581057533823761829436662099 |
| 11 | 392629621582222667733213907054116073 |
| 12 | 32456836304775204439912231201966254787 |
| 13 | 428027336071597254024922793107218595973 |