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 | 0 |
| 1 | 3 |
| 2 | 5 |
| 3 | 6 |
| 4 | 7 |
| 5 | 14 |
| 6 | 25 |
| 7 | 45 |
| 8 | 84 |
| 9 | 162 |
| 10 | 310 |
| 11 | 595 |
| 12 | 1165 |
| 13 | 2285 |
| 14 | 4486 |
| 15 | 8810 |
| 16 | 17310 |
| 17 | 34310 |
| 18 | 68025 |
| 19 | 134885 |
| 20 | 267485 |