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 | 3 |
| 2 | 14 |
| 3 | 209 |
| 4 | 3596 |
| 5 | 41624 |
| 6 | 2003639 |
| 7 | 24206049 |
| 8 | 2562857198 |
| 9 | 57721363052 |