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 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 23 |
| 5 | 104 |
| 6 | 535 |
| 7 | 3088 |
| 8 | 19937 |
| 9 | 144065 |
| 10 | 1165109 |
| 11 | 10518741 |
| 12 | 105460057 |
| 13 | 1166159683 |
| 14 | 14117684632 |
| 15 | 185784598853 |