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) |
|---|---|
| 3 | 1 |
| 4 | 6 |
| 5 | 42 |
| 6 | 377 |
| 7 | 4248 |
| 8 | 58269 |
| 9 | 947117 |
| 10 | 17848872 |
| 11 | 383237040 |
| 12 | 9243654925 |
| 13 | 247586590398 |
| 14 | 7293962774574 |
| 15 | 234458181733224 |
| 16 | 8167132024738422 |
| 17 | 306500617604837898 |
| 18 | 12329458457556027538 |
| 19 | 529269910501209999900 |