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 | 0 |
| 3 | 0 |
| 4 | 3 |
| 5 | 7 |
| 6 | 6 |
| 7 | 13 |
| 8 | 13 |
| 9 | 21 |
| 10 | 25 |
| 11 | 43 |
| 12 | 59 |
| 13 | 98 |
| 14 | 141 |
| 15 | 287 |
| 16 | 479 |
| 17 | 841 |
| 18 | 1504 |
| 19 | 2789 |
| 20 | 5049 |