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 | 2 |
| 3 | 4 |
| 4 | 11 |
| 5 | 33 |
| 6 | 148 |
| 7 | 906 |
| 8 | 8887 |
| 9 | 136756 |
| 10 | 3269264 |
| 11 | 115811998 |
| 12 | 5855499195 |
| 13 | 410580177259 |