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 | 7 |
| 3 | 19 |
| 4 | 163 |
| 5 | 487 |
| 6 | 1459 |
| 7 | 39367 |
| 8 | 86093443 |
| 9 | 258280327 |
| 10 | 411782264189299 |
| 11 | 116299474006080119380780339 |
| 12 | 3140085798164163223281069127 |
| 13 | 84782316550432407028588866403 |
| 14 | 20602102921755074907947094535687 |
| 15 | 1910009901593650473786381403548828023839870277948686259673707683 |