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 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 17 |
| 5 | 35 |
| 6 | 73 |
| 7 | 147 |
| 8 | 295 |
| 9 | 591 |
| 10 | 1181 |
| 11 | 2363 |
| 12 | 4729 |
| 13 | 9459 |
| 14 | 18917 |
| 15 | 37837 |
| 16 | 75673 |
| 17 | 151347 |
| 18 | 302697 |
| 19 | 605395 |
| 20 | 1210791 |
| 21 | 2421581 |
| 22 | 4843163 |
| 23 | 9686329 |
| 24 | 19372659 |
| 25 | 38745319 |
| 26 | 77490641 |
| 27 | 154981281 |
| 28 | 309962565 |
| 29 | 619925129 |
| 30 | 1239850261 |
| 31 | 2479700523 |
| 32 | 4959401047 |
| 33 | 9918802097 |