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 | 2 |
| 3 | 6 |
| 4 | 13 |
| 5 | 26 |
| 6 | 54 |
| 7 | 110 |
| 8 | 220 |
| 9 | 442 |
| 10 | 886 |
| 11 | 1772 |
| 12 | 3546 |
| 13 | 7093 |
| 14 | 14188 |
| 15 | 28377 |
| 16 | 56755 |
| 17 | 113510 |
| 18 | 227022 |
| 19 | 454045 |
| 20 | 908092 |
| 21 | 1816186 |
| 22 | 3632373 |
| 23 | 7264746 |
| 24 | 14529494 |
| 25 | 29058989 |
| 26 | 58117980 |
| 27 | 116235961 |
| 28 | 232471923 |
| 29 | 464943847 |
| 30 | 929887695 |
| 31 | 1859775392 |
| 32 | 3719550786 |
| 33 | 7439101572 |