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 | 2 |
| 2 | 11 |
| 3 | 56 |
| 4 | 370 |
| 5 | 2666 |
| 6 | 19126 |
| 7 | 134902 |
| 8 | 1026667 |
| 9 | 8049132 |
| 10 | 60996816 |
| 11 | 450456500 |
| 12 | 3427769018 |
| 13 | 27127841200 |
| 14 | 211563038980 |
| 15 | 1837421211974 |
| 16 | 15474223886906 |