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 | 11 |
| 3 | 47 |
| 4 | 221 |
| 5 | 1433 |
| 6 | 9579 |
| 7 | 69044 |
| 8 | 519260 |
| 9 | 4056919 |
| 10 | 32504975 |
| 11 | 266490184 |
| 12 | 2224590493 |
| 13 | 18850792161 |