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 | 5 |
| 7 | 12 |
| 8 | 28 |
| 9 | 62 |
| 10 | 136 |
| 11 | 294 |
| 12 | 628 |
| 13 | 1328 |
| 14 | 2787 |
| 15 | 5810 |
| 16 | 12043 |
| 17 | 24840 |
| 18 | 51016 |
| 19 | 104380 |
| 20 | 212848 |
| 21 | 432732 |
| 22 | 877400 |
| 23 | 1774672 |
| 24 | 3581605 |
| 25 | 7213746 |
| 26 | 14502449 |
| 27 | 29106100 |
| 28 | 58323844 |
| 29 | 116702074 |
| 30 | 233199000 |
| 31 | 465405058 |
| 32 | 927744428 |
| 33 | 1847359520 |
| 34 | 3674769991 |