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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 8 |
| 5 | 43 |
| 6 | 283 |
| 7 | 1946 |
| 8 | 14010 |
| 9 | 103292 |
| 10 | 776784 |
| 11 | 5931402 |
| 12 | 45870248 |
| 13 | 358501321 |
| 14 | 2827227425 |
| 15 | 22469524972 |
| 16 | 179785568562 |
| 17 | 1447059691048 |
| 18 | 11708296894260 |
| 19 | 95176461591230 |
| 20 | 776935668014674 |
| 21 | 6366225809581766 |
| 22 | 52344041948585714 |