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 | 1 |
| 3 | 0 |
| 4 | 2 |
| 5 | 1 |
| 6 | 4 |
| 7 | 6 |
| 8 | 12 |
| 9 | 25 |
| 10 | 46 |
| 11 | 96 |
| 12 | 183 |
| 13 | 368 |
| 14 | 720 |
| 15 | 1424 |
| 16 | 2809 |
| 17 | 5536 |
| 18 | 10930 |
| 19 | 21545 |
| 20 | 42516 |
| 21 | 83846 |
| 22 | 165404 |
| 23 | 326257 |
| 24 | 643550 |
| 25 | 1269440 |
| 26 | 2503983 |
| 27 | 4939232 |
| 28 | 9742752 |
| 29 | 19217952 |
| 30 | 37908017 |
| 31 | 74774848 |
| 32 | 147495906 |
| 33 | 290940561 |
| 34 | 573890084 |
| 35 | 1132017286 |
| 36 | 2232942124 |