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 | 1 |
| 5 | 2 |
| 6 | 7 |
| 7 | 15 |
| 8 | 31 |
| 9 | 68 |
| 10 | 148 |
| 11 | 310 |
| 12 | 664 |
| 13 | 1345 |
| 14 | 2768 |
| 15 | 5673 |
| 16 | 11605 |
| 17 | 23665 |
| 18 | 48035 |
| 19 | 97599 |
| 20 | 197383 |