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 | 12 |
| 3 | 232 |
| 4 | 4621 |
| 5 | 92181 |
| 6 | 1838992 |
| 7 | 36687652 |
| 8 | 731914041 |
| 9 | 14601593161 |
| 10 | 291299949172 |
| 11 | 5811397390272 |
| 12 | 115936647856261 |
| 13 | 2312921559734941 |
| 14 | 46142494546842552 |
| 15 | 920536969377116092 |
| 16 | 18364596892995479281 |
| 17 | 366371400890532469521 |
| 18 | 7309063420917653911132 |