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 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 11 |
| 5 | 23 |
| 6 | 39 |
| 7 | 79 |
| 8 | 143 |
| 9 | 287 |
| 10 | 543 |
| 11 | 1087 |
| 12 | 2111 |
| 13 | 4223 |
| 14 | 8319 |
| 15 | 16639 |
| 16 | 33023 |
| 17 | 66047 |
| 18 | 131583 |
| 19 | 263167 |
| 20 | 525311 |
| 21 | 1050623 |
| 22 | 2099199 |
| 23 | 4198399 |
| 24 | 8392703 |
| 25 | 16785407 |
| 26 | 33562623 |
| 27 | 67125247 |
| 28 | 134234111 |
| 29 | 268468223 |
| 30 | 536903679 |
| 31 | 1073807359 |
| 32 | 2147549183 |
| 33 | 4295098367 |