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 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 12 |
| 6 | 30 |
| 7 | 61 |
| 8 | 124 |
| 9 | 247 |
| 10 | 491 |
| 11 | 980 |
| 12 | 1962 |
| 13 | 3949 |
| 14 | 7916 |
| 15 | 15863 |
| 16 | 31815 |
| 17 | 63692 |
| 18 | 127570 |
| 19 | 255529 |
| 20 | 511627 |
| 21 | 1024421 |
| 22 | 2051038 |
| 23 | 4105848 |
| 24 | 8218842 |
| 25 | 16450989 |
| 26 | 32926094 |
| 27 | 65897438 |
| 28 | 131879440 |
| 29 | 263915641 |
| 30 | 528125412 |
| 31 | 1056802576 |
| 32 | 2114639286 |
| 33 | 4231226460 |
| 34 | 8466125334 |
| 35 | 16939180972 |