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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 1 |
| 10 | 2 |
| 11 | 3 |
| 12 | 6 |
| 13 | 12 |
| 14 | 24 |
| 15 | 48 |
| 16 | 96 |
| 17 | 192 |
| 18 | 384 |
| 19 | 767 |
| 20 | 1532 |
| 21 | 3061 |
| 22 | 6116 |
| 23 | 12220 |
| 24 | 24416 |
| 25 | 48784 |
| 26 | 97472 |
| 27 | 194752 |
| 28 | 389120 |
| 29 | 777473 |
| 30 | 1553414 |
| 31 | 3103767 |
| 32 | 6201418 |
| 33 | 12390616 |
| 34 | 24756816 |
| 35 | 49464848 |
| 36 | 98832224 |
| 37 | 197469696 |
| 38 | 394550272 |
| 39 | 788323071 |
| 40 | 1575092728 |