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 | 7 |
| 2 | 39 |
| 3 | 219 |
| 4 | 1231 |
| 5 | 6921 |
| 6 | 38913 |
| 7 | 218789 |
| 8 | 1230147 |
| 9 | 6916539 |
| 10 | 38888455 |
| 11 | 218651553 |
| 12 | 1229375193 |
| 13 | 6912200477 |
| 14 | 38864063403 |
| 15 | 218514412227 |
| 16 | 1228604118319 |
| 17 | 6907865088537 |
| 18 | 38839687552689 |
| 19 | 218377358251349 |
| 20 | 1227833528067027 |
| 21 | 6903532420748427 |
| 22 | 38815326992539159 |