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 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | 0 |
| 4 | 2 |
| 5 | 4 |
| 6 | 8 |
| 7 | 16 |
| 8 | 29 |
| 9 | 52 |
| 10 | 98 |
| 11 | 180 |
| 12 | 334 |
| 13 | 620 |
| 14 | 1158 |
| 15 | 2164 |
| 16 | 4079 |
| 17 | 7675 |
| 18 | 14531 |
| 19 | 27538 |
| 20 | 52368 |
| 21 | 99758 |
| 22 | 190556 |
| 23 | 364520 |
| 24 | 698867 |
| 25 | 1341840 |
| 26 | 2580765 |
| 27 | 4970378 |
| 28 | 9586394 |
| 29 | 18511572 |
| 30 | 35790266 |
| 31 | 69271484 |
| 32 | 134215581 |
| 33 | 260296905 |
| 34 | 505286404 |