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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 1 |
| 11 | 2 |
| 12 | 4 |
| 13 | 8 |
| 14 | 16 |
| 15 | 31 |
| 16 | 62 |
| 17 | 124 |
| 18 | 248 |
| 19 | 496 |
| 20 | 992 |
| 21 | 1983 |
| 22 | 3964 |
| 23 | 7924 |
| 24 | 15840 |
| 25 | 31664 |
| 26 | 63297 |
| 27 | 126532 |
| 28 | 252940 |
| 29 | 505632 |
| 30 | 1010768 |
| 31 | 2020544 |
| 32 | 4039105 |
| 33 | 8074246 |
| 34 | 16140568 |
| 35 | 32265296 |
| 36 | 64498928 |
| 37 | 128934559 |
| 38 | 257742586 |
| 39 | 515232232 |
| 40 | 1029958832 |
| 41 | 2058906896 |