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 | 5 |
| 4 | 15 |
| 5 | 52 |
| 6 | 200 |
| 7 | 830 |
| 8 | 3654 |
| 9 | 16869 |
| 10 | 80963 |
| 11 | 401300 |
| 12 | 2043610 |
| 13 | 10649335 |
| 14 | 56604706 |
| 15 | 306101789 |
| 16 | 1680515427 |