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 | 5 |
| 4 | 20 |
| 5 | 83 |
| 6 | 594 |
| 7 | 2641 |
| 8 | 10856 |
| 9 | 43623 |
| 10 | 305766 |
| 11 | 1354341 |
| 12 | 5548644 |
| 13 | 22325859 |
| 14 | 89434722 |
| 15 | 357870241 |
| 16 | 1431612752 |
| 17 | 5726580047 |