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 | 0 |
| 5 | 2 |
| 6 | 4 |
| 7 | 14 |
| 8 | 28 |
| 9 | 70 |
| 10 | 140 |
| 11 | 310 |
| 12 | 621 |
| 13 | 1302 |
| 14 | 2607 |
| 15 | 5335 |
| 16 | 10675 |
| 17 | 21593 |