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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 43 |
| 4 | 231 |
| 5 | 1337 |
| 6 | 9739 |
| 7 | 76209 |
| 8 | 706109 |
| 9 | 6914977 |
| 10 | 78150249 |
| 11 | 920172983 |
| 12 | 12216376453 |
| 13 | 168531536319 |
| 14 | 2571960399839 |
| 15 | 40581616143967 |
| 16 | 701349512411763 |
| 17 | 12460393480873445 |
| 18 | 240094506439569631 |
| 19 | 4749510978132662277 |