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 | 11 |
| 3 | 209 |
| 4 | 5643 |
| 5 | 197505 |
| 6 | 8492715 |
| 7 | 433128465 |
| 8 | 25554579435 |
| 9 | 1712156822145 |
| 10 | 128411761660875 |
| 11 | 10658176217852625 |
| 12 | 969894035824588875 |
| 13 | 96019509546634298625 |
| 14 | 10274087521489869952875 |
| 15 | 1181520064971335044580625 |
| 16 | 145326967991474210483416875 |
| 17 | 19037832806883121573327610625 |