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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 3 |
| 6 | 7 |
| 7 | 15 |
| 8 | 32 |
| 9 | 66 |
| 10 | 134 |
| 11 | 270 |
| 12 | 543 |
| 13 | 1089 |
| 14 | 2181 |
| 15 | 4365 |
| 16 | 8734 |
| 17 | 17472 |
| 18 | 34948 |
| 19 | 69900 |
| 20 | 139805 |
| 21 | 279615 |
| 22 | 559235 |
| 23 | 1118475 |
| 24 | 2236956 |
| 25 | 4473918 |
| 26 | 8947842 |
| 27 | 17895690 |
| 28 | 35791387 |
| 29 | 71582781 |
| 30 | 143165569 |
| 31 | 286331145 |
| 32 | 572662298 |
| 33 | 1145324604 |
| 34 | 2290649216 |
| 35 | 4581298440 |