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 | 2 |
| 6 | 7 |
| 7 | 14 |
| 8 | 37 |
| 9 | 74 |
| 10 | 176 |
| 11 | 352 |
| 12 | 794 |
| 13 | 1588 |
| 14 | 3473 |
| 15 | 6946 |
| 16 | 14893 |
| 17 | 29786 |
| 18 | 63004 |
| 19 | 126008 |
| 20 | 263950 |
| 21 | 527900 |
| 22 | 1097790 |
| 23 | 2195580 |
| 24 | 4540386 |
| 25 | 9080772 |
| 26 | 18696432 |
| 27 | 37392864 |
| 28 | 76717268 |
| 29 | 153434536 |
| 30 | 313889477 |
| 31 | 627778954 |
| 32 | 1281220733 |
| 33 | 2562441466 |
| 34 | 5219170052 |
| 35 | 10438340104 |