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 | 21 |
| 4 | 357 |
| 5 | 5797 |
| 6 | 93093 |
| 7 | 1490853 |
| 8 | 23859109 |
| 9 | 381767589 |
| 10 | 6108368805 |
| 11 | 97734250405 |
| 12 | 1563749404581 |
| 13 | 25019996065701 |
| 14 | 400319959420837 |
| 15 | 6405119440211877 |
| 16 | 102481911401303973 |