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 | 7 |
| 3 | 47 |
| 4 | 303 |
| 5 | 1921 |
| 6 | 11963 |
| 7 | 74130 |
| 8 | 454484 |
| 9 | 2779152 |
| 10 | 16882278 |
| 11 | 102384151 |
| 12 | 618136584 |
| 13 | 3727827148 |
| 14 | 22408576099 |
| 15 | 134595908277 |
| 16 | 806452390868 |