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 | 17 |
| 4 | 229 |
| 5 | 3105 |
| 6 | 44930 |
| 7 | 674292 |
| 8 | 10217420 |
| 9 | 154980130 |
| 10 | 2350703747 |
| 11 | 35658264301 |
| 12 | 540957030465 |
| 13 | 8206939419403 |