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 | 2 |
| 4 | 6 |
| 5 | 12 |
| 6 | 44 |
| 7 | 92 |
| 8 | 184 |
| 9 | 1208 |
| 10 | 1256 |
| 11 | 4792 |
| 12 | 9912 |
| 13 | 19832 |
| 14 | 39664 |
| 15 | 563952 |
| 16 | 576464 |
| 17 | 4496112 |
| 18 | 4499184 |
| 19 | 17996528 |
| 20 | 17997488 |
| 21 | 143972080 |
| 22 | 145057520 |
| 23 | 145070832 |
| 24 | 294967024 |
| 25 | 589944560 |
| 26 | 1179889136 |
| 27 | 2359778272 |
| 28 | 71079255008 |
| 29 | 72019201952 |