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 | 2 |
| 5 | 8 |
| 6 | 26 |
| 7 | 68 |
| 8 | 164 |
| 9 | 370 |
| 10 | 806 |
| 11 | 1706 |
| 12 | 3554 |
| 13 | 7312 |
| 14 | 14930 |
| 15 | 30312 |
| 16 | 61318 |
| 17 | 123700 |
| 18 | 249096 |
| 19 | 500912 |
| 20 | 1006316 |